As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU POWER WILL NOT CONNECT TO AIRPLANE. APU GEN CONT UNIT CIRCUIT BREAKER TRIPPED. ACFT GROUNDED. ACCOMPLISHED GVI OF CIRCUIT BREAKER AND ASSOCIATE ACCESSIBLE WIRING, NO DEFECTS NOTE. RESET THE CIRCUIT BREAKER IAW AMM 20-60-01-860-801. ACCOMPLISHED FIM 24-21 TASK 820. APU OPS CHECKED OKAY.