In order of common failure for 5V...
CN1
C2
C7
If your issue is the PS, and your game is simply resetting during game play your issue is CN1. C2 and C7 will cause slow or no boots, but not really resets.
4.8V out of the PS is fine though. And although not as common as the above parts, the regulator IC does go, but again, not your issue here.
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Rob Anthony
Pinball Classics
http://LockWhenLit.com
Quality Board Work - In Home Service
borygard at gmail dot com