What was found
DURING PUSH BACK ON GROUND, GOT INTERMITTENT FIRE BELL WARNING. FOUND LIGHT IN APU HANDLE ILLUMINATED. PERFORMED 1'S, PERFORMED CHECKLIST, CALL FIRE RESCUE AND HAD MX CHECK FOR FIRE. FIRE LIGHT IN HANDLE REMAIN ON. AS PER MAINT CONTROL APU OPERATION DEFERRED PER DMI CONTROL NR 31939, TRANSFERRED IAW ASTAR MEL 26-11. SPECIAL PROCEDURES C/W CAT C PLACARD. INSTALLED DROP DEAD 3/14. OPS CK APU FIRE DETECTION SYS, FOUND NO DEFECTS. APU FOUND TO BE SERVICEABLE IAW MM 26-15-00. THIS CLEARS DMI 31939. PLACARD REMOVED, AIRCRAFT WAS GROUNDED.