What was found
LOWER AFT BODY OVERHEAT LIGHT ILLUMINATED APPROX 5 MINS AFTER SWAPPING BLEEDS FROM NR 1 TO NR 2 ON THE ALTIMETERS CHECKLIST. RAN THE LOWER AFT BODY OVERHEAT LIGHT CHECKLIST AND THE LIGHT EXTINGUISHED AFTER SWAPPING BLEEDS BACK TO NR 1. CONTINUED FLIGHT WITH NR 1 BLEED FOR THE LEFT PACK, TESTED OK. REMOVED AND REPLACED PNEUMATIC DUCT FROM NR 2 ENGINE BLEED RUN ENGINE NR 2, LEAK TEST OK.