As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"INTERNAL LOAD FAULT FWD L" DISPLAYED ON PTP DURING EMER LIGHT SYS TEST. SWAPPED FWD AND AFT EPSU'S AND ALL TESTED OK. INTERNAL LOAD FAULTS WILL APPEAR IF THE LOAD ON THE EPSU IS DIFFERENT THAN WHAT THE UNIT "LEARNED" AT IT'S ORIGINAL LOCATION DURING "TEACH-IN". MOVING THE EPSU TO A POSITION WHERE THE LOAD MATCHES WHAT THE UNIT EXPECTED IS ACCEPTABLE.