Did you sort this out? An old Easi can run you in the poorhouse.
You can put multiple Q1s and rec ones, system cards, power cards. Very poor system. Before changing any parts on a RayRay, you must check for shorts to frame, battery shorts and proper static strap. Remove crappy insulators from heat sink and replace they burn holes and shirt under load. Anything less than 10 thousand ohms will shirt out Q1. Test each motor
Loose power cards, CD8 cards, Transistor modules plugs loose, best to have truck jacked up, driving wheel spinning and throttle engaged. Wiggle gently on all connections..you may locate bad connections

Ok- replaced VFM with known good. I travel for a bit, and now CODE 41. I don't have this code in my book, but must do with travel course it cuts in slow mode