As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING EMERGENCY LIGHT TEST FAULTING INT LOADS FWD LT AND FWD. EPSU FAULTING INTERIOR AND EXTERIOR LIGHTS AND BOTH ARE BLINKING. DOOR 1L ESCAPE SLIDE CAN ONLY BE USED DURING DAYLIGHT OPERATIONS DUE TO EMERGENCY LIGHT INOP. REPLACED 1L EPSU 10WL AND BATTERY. FOUND LIGHT BULB MESSAGE AT L2 DOOR. REPLACED BULB, TESTS OKAY.