The feature lamps work by strobing 18v quickly to get average around 6v. If the 18v is locked on a lamp would look really bright and an LED may burn up. I suppose the MPU could be at fault, but it could be something on the power driver board or even the LEDs themselves.

Your other thread shows another possible common denominator... budget LEDs with a current limiting resistor value to achieve max brightness at the sake of longevity. Maybe a bad batch of LEDs so maybe trying a higher quality SMT style LED. The SMT ones are so much better quality that its worth it.

The ASIC on the MPU tells the driver board to read the CPU data bits to use those to update the lamps. The rest of the lamp driving is done on the power driver board.

For MPU to be a problem it would have to be telling the driver board to leave on the lamps and not strobe them rapidly. Make sure no pins on the asic got damaged when you moved it over to the new board.

Best I can tell the Rdog MPU is pretty faithful to the original WMS design electrically so I don't think it would be a design of the replacement board issue.