As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING T/C 78233001 FOUND LEFT OVERWING AFT EXIT LIGHT & LEFT OVERHEAD BIN EXIT LIGHTS ROW 1-12 INOP & RT FWD OVERWING EXIT LIGHT & RT OVERHEAD BIN LIGHTS 18-23 INOP. GROUNDED - YES. REPLACED THREE BATTERY PACKS AND ONE POWER SUPPLY INSTALLATION TEST PASSES REF AMM 33-51-06/201.