What was found
ONE BANK OF EMERGENCY LIGHTS STAY ILLUMINATED, ROW 22..27 WITNESSED AISLE LIGHTS TURN ON UNCOMMANDED & OFF UNCOMMANDED AFTER A FEW MINS. BATTERY PACKS ARE CHARGED. IAW FIM 33-50 TASK 801. REF IPC 33-51-06-22A. CHKD POWER SUPPLY & BATTERY M1671 IAW AMM 32-09-10-400-801, FOUND TEST SWITCH DAMAGED ON POWER SUPPLY, SUSPECT POWER SUPPLY ENTERING TEST MODE INTERMITANTLY DUE TO BROKEN TEST SWITCH. SWAPPED POWER SUPPLY M1671 WITH M1670, MONITORED FOR SEVERAL HRS & COULD NOT DUPLICATE FAULT. SWAPPED POWER SUPPLIES BACK TO ORIGINAL POSITIONS. M1671 TESTED & CHKD GOOD IAW AMM 33-51-06-960-806. INSTALLED SERVICEABLE POWER SUPPLY IAW AMM 33-51-06. BATTERY RETAINED & INSTALLED ON NEW POWER SUPPLY. OPS CHKD OK.