As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POWER SUPPLY - BATTERY PACK CAPACITY CHECK PROCEDURE - 4, PROXIMITY LIGHTS LT & RT AND 4 MAIN AISLE RT SIDE SEAT ROWS 33 TO 36. AND 3 MAIN AISLE LIGHTS LEFT SIDE IN FIRST CLASS DID NOT STAY ILLUMINATED AT LEAST 15 MIN DURING TEST. REPLACED THE BATTERY PACK FOR POWER SUPPLY M33404 & BATTERY PACK AT POWER SUPPLY M33424 IAW AMM 33-51-06. OPS CHECKED GOOD.