The game still resets.

Resets remain after rectifiers, caps and connectors are done

Cause: A weak +5 V regulator (LM323 on WPC-S and earlier, LM317K on WPC-95), a leaky LM339 comparator at U6 (U1 on WPC-95), heat trouble in CPU board chips U1, U2 and U3, or a damaged U8 6264 RAM on the CPU board.

Checks

• Work through the regulator, then the LM339, then the CPU board chips.

Fix

• Replace the regulator; it is cheap and a common failure.
• Replace the LM339 in a socket.
• Replace CPU board U1-U3 or the U8 RAM if implicated; the RAM is static-sensitive.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• Resets continue although the bridge and diodes test good
• Resets: +5 V at the driver board test point is low
• WPC power driver bridge rectifiers and +5 V regulator
• GI strings won't dim in the GI test
• Optos test good but still don't work: the opto board
• "Check Fuse F114/F115" (F106/F101 on WPC-95): step-by-step
• Fliptronics: flipper coil gets hot after a while of play
• Fliptronics and WPC-95: weak flipper

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Two, Clay Harrell (pinrepair.com)