e4mafia - there is a service bulletin explaining how to remove the speaker wiring from the main loom and twist the speaker wiring and re-connect.
I simply replaced, and re-routed the wiring with some balanced shielded mic cable I had left on a reel for the run from the amp to backbox speakers and the sub.
This, plus increasing the signal level to the amp, and in turn using less gain on the amp, has made the hiss barely audible even in a quiet room.

What value/rating are the caps please?

There is hope for Utilite alternatives. The packages for the game have been complied for ARMv7 architecture.
In the targetsysupdate dir on the USB stick which has to be plugged in there are 4 .deb packages. freewpc_1.41-r0_armel, fth-firmware_13.06-r0_armel, videoserver_1.0-r0_armel and fth-media_1.20-r0_armel

I pulled them apart today and looked over the control and data files within and I reckon with dpkg -i on an ARMv7 box running say Debian or Arch, it would work
Pinprog and videoserver are elf files.

No more Utilite, U-Boot, old kernels.
Some changes to some .rc files may be needed but it looks like the .deb packages take care of all of that.

Saw this on the logs today:
0000 ERROR: sound object 20 file music/Music_Cue1.ogg does not exist
0000 ERROR: sound object 22 file music/Music_Cue3.ogg does not exist
0000 ERROR: sound object 34 file fx/fx_2.ogg does not exist
0000 ERROR: sound object 60 file fx/fx_Crowd3.ogg does not exist
0000 ERROR: sound object 62 file fx/fx_CrowdBG.ogg does not exist
0000 ERROR: sound object 63 file fx/fx_CrowdBoo.ogg does not exist
0000 ERROR: sound object 103 file vo/vo_Cheater_Val.ogg does not exist
0000 ERROR: sound object 145 file vo/vo_MoreSkill_Val.ogg does not exist
0000 ERROR: sound object 161 file vo/vo_PlayFair_Val.ogg does not exist
0000 ERROR: sound object 170 file vo/vo_SpecialLit.ogg does not exist
0000 ERROR: sound object 183 file vo/vo_TooBad.ogg does not exist
0000 ERROR: sound object 199 file vo/vo_WonChallengeCup_Mac.ogg does not exist
0000 ERROR: sound object 292 file vo/vo_Replay.ogg does not exist
0000 ERROR: sound object 293 file fx/fx_InitialLeft.ogg does not exist
0000 ERROR: sound object 294 file fx/fx_InitialRight.ogg does not exist

After much tom-foolery, and reading a lot of Yocto Project doco, this is what
I know:
The FT OS was built using the Yocto Project using the reference distro Poky.
Yocto creates custom embedded linux distros for embedded devices, such as the Utilite and thousands of other devices.
The FT Yocto build is specific to the Utilite and uses a board support package
(BSP - a bit like DTB's) provided by Compulab, the Utilite manufacturer, and is referred to as a layer.
The meta-yocto-bsp layer can have lots of different BSP's.
When the Dev compiles the linux kernal, he/she
selects the target architecture - ARMv7, x86, x64 etc and the Bob's 'yer uncle.

Additionally, Yocto contains a cross-dev toolchain, meaning the Dev can use it for compiling their code for any
architecture. ARMv7, x86, x64 yada yada at the press of a button.

The FT 1.41 image has been compiled only for ARMEL EABI (extended application binary interface soft float).
It won't work with ARMHF but this is not relevant - just a useless piece of info.

The .deb packages used in the game are linked using ELF (linking) files and these are ARMv7 specific so
just installing the .deb's to say Ubuntu or Debian on a different architecture won't work, but may if we can seperate root fs from userland on an ARMEL device.

With no access to the Yocto build and it's upstream source code, we need Brian Dominy bcd

Hopefuly he'll get a laugh out if this:

Help us Mr Obi-Wan Odd Change. You are our only hope. Years ago, you served our Full Throttles.
Now we beg you to help us in our struggle against the Utilites. I regret that I am unable to present this request to you in person, but my Full Throttle has fallen under attack and I'm afraid my mission to bring you to Yocto has failed.
I've placed information vital to the survival of the rebellion into the memory systems of this post.
My FT brothers will know how to retrieve it. You must see this code compiled and safely delivered to us on Pinside.
This is our most desperate hour.
Help us, Obi-Wan Odd Change. You're our only hope.

Bill - test the LCD from a laptop.
Remove the HDMI-DVI cable from the Utilite, leave the DVI end connected to the playfield LCD and plug the DVD end into your laptop DVD port.
The LCD will need to power from the game or another source.

If the display if still missing the section, try a new cable. If it's good with a laptop, try the cable in the second DVD port on the Utilite.

From memory it works on both ports and this line is in the u-Boot.scr (Utilite bootloader):
setenv video "video=mxcfb1:dev=hdmi,1280x800M@50,if=RGB24 video=mxcfb0:dev=dvi,1280x800M@50,if=RGB24 bpp=24 fbmem=48M"

Wheelzzz - you should be sorted.