I've been getting intermittent game resets (especially during multiball) on Whirlwind. I've been down this road before with a WPC game, WH2O.
Diodes have all been checked on the flippers - all good.
Found a suspect on the Aux Power Board (see picture). Hmmm...
Not going to mess around and just shotgun the usual suspects for replacements using vid1900 and Schwaggs System 11 guides.
Off to Great Plains to load up on rebuild parts for the power boards (caps, transistors, resistors, zeners, plugs and headers, fuses, etc. & a couple of heat sinks thrown in for good measure).
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