What was found
DURING CLIMB, SMOKE ALARMS IN BOTH AFT LAVATORIES WENT ON, SMOKE WAS NOTICED. AFTER 20 OR 3 MINUTES IT WAS CLEAR, AFT GALLEY POWER WAS SWITCHED OFF AS PRECAUTIONARY A/C CONTINUED TO MIAMI. ON THE GROUND, FOUND AFT CABIN CEILING LIGHTS DUAL FILTER BALLAST BURNED OUT AND ONE TERMINAL LOOSE ON BALLAST. REMOVED AND REPLACED FILTER BALLAST AND CHECKED WIRES PER MM 33-20-32 AND 33-20-61, OPS CHECKED SYSTEM, OK. AIRCRAFT RETURNED TO SERVICE. (M)