As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: WHILE DOING EPSU SYS TEST CIDS 1 FOUND FAULT 335112 FPEEPMS CROSS AISLE LT/ EPSU(13WL) AFT L FAULT - MAINTENANCE REPLACED LAV EMERGENCY LIGHT ASSEMBLY PER CMM 25-43-54 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK WITH NO DEFECTS NOTED