As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 10,000 FEET AFTER CYCLING THE NO SMOKING SIGN ON, AUTO THE MID AISLE OVERHEAD EXIT LIGHT AND OVERWING EXIT LIGHT ON AIRCRAFT LEFT BECAME INOPERATIVE. R & R THE LT OVERWING EPSU AND BATTERY PACK IAW AMM 33-51-38. OPS CHECKED NORMAL.