What was found
NORMAL LOADED TAKE-OFF & ROTATION. RECIP NR 2 FIRE LIGHT ILLUMINATED WITH THE AIRCRAFT AIRBORNE OVER THE END OF THE RUNWAY AND ENGINE POWER AT TAKE-OFF POWER. POWER WAS REDUCED TO CLIMB POWER SETTING AND THE LIGHT EXTINGUISHED IMMEDIATELY. LOAD WAS JETTISONED AND THE ENGINE WAS SHUT DOWN AS A PRECAUTIONARY MEASURE. IFE WAS NOT DECLARED. PERFORMED AN UNEVENTFUL LANDING. POST FLIGHT INSPECTION AND MAINTENANCE REVEALED A DEFECTIVE EXHAUST PIPE LEAKING ONTO THE FIRE DETECTION ELEMENT. EXHAUST PIPE WAS R&R'D, ENGINE GROUND RUN, RETURNED TO SERVICE, AND A SUCCESSFUL CHECK FLIGHT WAS CONDUCTED.