Dover t3 with generator

Took on a job been oos for 1year other company changed tach and dar brd car runs but on accel and decel car ride is erratic after 2days car is in overhead faults 52,15,10 looked up tach faults says to adjust pots t,ir,rhave no write up on anything about how to adjust any pots or what pots stand for never worked on a t3before could really use some suggestions.

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I suggest before pot tweaking make sure the loop circuit is free of grounds or at least 1 meg or more above ground. If grounds exist in rigging, armatures, or interpoles anything you do will keep changing.