A couple suggestions. Check continuity from PPB relay K1 to the non banded side of D22 to J6 pin 9 to CPU CN12 pin 2 Black/Red wire. Q29 on the CPU drives relay K1 or in other words provides the ground that energizes K1. Q29 may be bad or have a bad solder joint. Check continuity with everything associated with Q29 and pre driver Q21. Test Q21 and Q29. I think you can ground Q29 to energize Relay K1 to confirm continuity in the circuit. Check fuse F6 on PPB and continuity with everything associated with F6. F6 connects to J6 pins 4&5 orange wires. That is where flasher power comes from. It seems as if K1 isn't being energized to send power to the flashers and the non working coils. Or it could be energized and not being DE energized when needed. It is a left right relay being turned on and off by the game program to send power to coils and flash lamps when needed.
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