What was found
SUPPLEMENTAL LAV SMOKE WARNING IN FLIGHT. C/A-FOLLOWED FIM TASK 26-14-00-810-802-A. FOUND POSSIBLE FAULTY DETECTOR. DEFERRED LAVATORY SMOKE DETECTION SYS. "M" PROCEDURES C/W..MEL# 26-01 AUTH# 090669DM-C. INSPECTED LAVATORY LIGHTS AND BALLAST. RAR COURTESY LIGHTS FLOURESCENT LAMPS IAW AMM 33-28-03, OPS CHECK GOOD IAW 33-28-00. FURTHER TROUBLESHOOTING REQUIRED. MELS REMAINS OPEN. C/W LAVATORY SMOKE DETECTION SYSTEM OPERATIONAL CHECK IAW AMM 26-14-00 OPS CHECK GOOD. NO DEFECTS NOTED AT THIS TIME. MEL RESTORED. REMOVED AND REPLACED LAVATORY SMOKE DETECTOR PANEL AND SENSOR IAW AMM 26-14-01 OPS CHECK GOOD IAW AMM 26-14-00-700-801-A.