What was found
DURING SECOND LEG OF FLIGHT AFTER TAKEOFF APU FIRE WARNING CAME ON INTERMITTENTLY. PLACED ON DMI 346 PER MEL 49-1 CAT C DUE ON 3/29/11 PLACARDS INSTALLED. MEGGERED APU FIRE WARNING SYSTEM REF WDM 26-15-12 FOUND WIRE DAMAGED IN SEVERAL SPOTS ON WIRE RUN W720-W193-18B. REPLACED WIRE RUN W720-W193-18B FROM CONNECTOR D00635 TO "A" LOOP CONNECTOR DM2160. REPLACED CONNECTOR DM2160 CORRECTED ALL TWISTED WIRING, SYS OP'S CHECK NORMAL REF WDM 26-15-12, SWPM 20-62-15, 20-61-11 AND AMM 26-15-00. ALL APU ENGINE LOOPS FOUND TO BE WITH IN TOLERANCE REF. AMM 26-10-011 AND CMM 26-11-78 CLEARED DMI 346 PLACARDS REMOVED.