As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 1A PHASE 1 TASK CARD 335100-03-1-001. CABIN EMERGENCY LIGHTING OPERATIONS CHECK. FOUND DEU-B AT FIN 300RH5 FAULTING, REF NR 706172 & CT 706195 FOR FURTHER T/S. SWAPPED WIRES 3351-1803B & 3351-1803R TO CORRECT PIN LOCATIONS, REF AWM 33-15-01 P 0032 SHEET 2. INITIATED EPSU BATTERY TEST, TEST RUNNING. EPSU COMM AFT L FAULT NO LONGER PRESENT.