The attached picture shows no ROM in K3, and the ROMs in N3 and K2 have tape over a "window"/LED ?!?!. So, is it obvious that I have no sound due to missing ROM? And if so, how do I get one?

If not, I worked through responses on the Gottlieb forum, and confirmed I have power supply to the sound board as should be; and I followed the pinwiki below - and need help interpreting my results:
Pinwiki:
"5.18.6 System 80B Sound Board (MA-766):
Since this sound board is really just a more complex MPU board, or single board computer, the usual diagnostic steps are in order.

Verify the ROM images are valid.
Ensure that the reset signal begins low and then transitions to high after about 1/2 second.
Ensure that the external clock signal is present at pin 37 of both 6502 processors.
Ensure that the data lines on the 6502 (pins 33 through 26) are pulsing.
Ensure that the address lines on the 6502 (pins 9 through 20, 22 through 25) are pulsing.
Ensure that the external clocks are pulsing at pins 3 and 39 of the 6502 processors."

So my Raven's sound board LED blinks, and the first three steps and last step above verify. But what if step 4 has the N1 6502 pins 33-26 are not pulsing; and step 5 has the N1 6502 pins 9-20 and 22-25 not pulsing and the T3 6502 pins 9-20 & 22 pulsing yet pins 23-25 not pulsing - how do I interpret that? Is it as simple as the 6502s aren't functioning correctly?

Raven sound board pic (resized).jpg