As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WILL NOT TRANSFER POWER TO LEFT SIDE. A/C TRANSFER BUSS 1 ACCEPTS POWER FROM GP AND GENERATOR 1 WILL NOT ACCEPT POWER FROM APU, SOURCE OFF LIGHT ILLUMINATES. ACFT GROUNDED. T/S SYSTEM, FOUND AUXILIARY POWER BREAKER C803 INOPERATIVE. R & R AUXILIARY POWER BREAKER, REF AMM 24-21-41-400-801. OPS CHECK OK.