What was found
AT APPROXIMATELY 700 FT DURING FINAL, LEVEL 3 ENG 2 FIRE BELL AND WARNING STAYED ON FOR 3-4 SECONDS, THEN WENT OUT. MOVED THROTTLE TO IDLE AFTER SECOND WARNING AT 500FT. WARNING WENT OUT AGAIN. DECIDED TO LAND THE ACFT. IN THE FLARE, THE WARNING OCCURED A THIRD TIME. ROLLOUT NORMAL. AFTER LANDING COMPLETED PHASE 1 AND SHUTDOWN THE NR 2 ENGINE. BLEW THE NR 2 AGENT BOTTLE. NO FURTHER LIGHTS AND WARNINGS. COMPLETED INSTALLATION OF 14 STAGE MANIFOLD DUCTING AND TOLERANCE TAKE UP DUCT ASSY IAW AMM 36-14-03-4-1, WRAPPED DUCT BOSSES AND CLAMPS WITH FOIL AND PERFORMED A LEAK CHECK IAW AMM 36-14-03-5-1. GROUND RAN ENGINE IAW JRH, NO LEAKS, ALL PARAMETERS NORMAL, OK FOR SERVICE.