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I'm a newbie restorer. Just put an alltek mpu into a stern nineball along with new driver and rectifier boards, repinned the driver brd, rectifier brd & two left plugs on the mpu. Will do them all eventually. Currently, game boots up fine but can't start a game, nor go into diagnostics from the front door switches. Can do self tests from the alltek mpu board. I am thinking it's maybe a continuity problem with the door switches or a switch matrix issue. However, i just want to check i'm not missing something. On boot up i get the image attached - 21 credits, don't know what the 27 or 600 means. Next step is finishing off the repinning.