As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PREFLIGHT FROM LOG PAGE 1179023 EMERGENCY LIGHTS ARMED AND GENERATOR OR EXTERNAL POWER ON-LINE. EMERGENCY LIGHTS CWP ILLUMINATES AND CABIN EMERGENCY LIGHTS FLICKER ON AND OFF. SLIGHT OZONE SMELL NOTED BY CREW, COULD NOT REPEAT. MAINTENANCE FOUND PIN C ON 20LN, 21LN, AND FOUND 28VDC AT PIN C ON 23LN, & 24LN DISC 20: REPLACED EMERGENCY OVERHEAD PANEL PN 7239050-512. OPS CHECK GOOD.