As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ENGINE RUN, LEFT ENGINE N2 WAS AT 64, RIGHT ENGINE N2 WAS 69. PULLING POSITION AIR-GND 2 CB CAUSED ENGINE 2 N2 TO MATCH ENGINE 1. SUSPECT AIR-GROUND RELAY PROBLEM, POSSIBLY K205 OR K207. REPLACED RELAYS K205 AND K207. RUNS OK NO IDLE DISAGREE.