When Williams added the Aux power supply they added 8 Tip36a transistors to switch high current coils instead of snubber relay boards. For this game coils # 3a 4a 6a 7a 13 and SPL #2 and #4 are controlled by both the CPU transistors and the Aux power supply transistors.

cody_chunn posted the page from the manual which shows the CPU transistors for the coils you are testing. And page 61 of the manual shows the other 8 transistors on the Aux power supply.

For example to troubleshoot coil 3a you need to test transistor Q-32 on the CPU board and Q-1, D-3 on the aux board for shorts that would lock on a coil and blow the fuse.

You can divide the number of coils in half by removing J12 on the aux p/s and testing for ohms on pin 6 and pin 12 of the connector to ground. One of this pins will read low ohms @ 1-2 ohms.

It is on page 1 of 4 on the right hand side of the page. The 6 SS TIPs are in a group by the flipper relay on the CPU board.

Here is a tip, system 11 boards are basically the same so you can use schematics for the CPU from a game that the printing is better. So try WW set.

Tip #2 replace Q-32 with a TIP 102 instead of a TIP 122 as it is 60 percent stronger. And any time a coil locks on long enough to burn the fuse you need to replace the diode and check the coil and sleeve.

Tip #3. I always pull the fuse for the problem coil before testing. After powering on the game I then check for problems by touching the fuse to the holder. If it sparks then I have more work to do.