What was found
HAD NO START ON ENG NR 3 RAN QRH ABNORMAL START CHECKLIST. GROUND CREW INFORMED FLT CREW OF TAIL FIRE. AFTER MOTORING ENGINE, STILL HAD FIRE IN ENG NR 3, BLEW FORE BOTTLE INTO NR 3 AND RAN ENGINE FIRE CHECK LIST. INSPECTED NR 3 ENGINE COWLS, PYLON, AND ENGINE. ALSO INSPECTED LOWER WING AREA AND RT GEAR STRUT FOR FIRE DAMAGE. REF MM 72-00-00-6 AND 72-00-00-7. NO CLEANING REQUIRED. REMOVED NR 3 ENG, NR 2 FIRE BOTTLE IAW AMM 26-21-01-4. INSTALLED SERVICEABLE FIRE BOTTLE & SQUIB REF MM 26-21-01-4. PERFORMED ENGINE RUN REFJRH, ENGINE STARTED ON B IGNITION AND ENGINE RUN NORMAL. REF WRI 74-10/8079 FOR NO START A IGNITION.