As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NO GND HANDLING POWER AVAILABLE WITH EITHER GND POWER OR APU POWER, HAVE FAULT 24052. POWER AVAILABLE UP TO RELAY R117 & R118 IAW WDM 24-51-71. REPLACED R118 & T97, NO HELP. REMOVED FLOOR PANEL & EXT PWR 1 BACK OVER FOR WIRING CHECKS. CHECKED WIRING FROM X1 OF R118 TO BCU 1 PIN G13, WIRE CHECKED NORMAL. ORDERED RELAY R117 & R7321 AIR GRD RELAY.