What was found
NR 6 EXHAUST STACK BROKEN AT FLANGE. LEAKING EXHAUST GASSES DAMAGED WIRING AND COWL NEXT TO STACK. PROBLEM OCCURRED DURING CLIMB-OUT, ENGINE WAS SECURED AND AIRCRAFT LANDED WITHOUT INCIDENT. TIME ON STACK UNKNOWN. BREAK APPEARED TO HAVE OCCURRED OVER A SHORT PERIOD OF TIME AS INDICATED BY EXHAUST GAS STAIN ON BROKEN PIECES. VISUAL INSPECTION OF EXHAUST PARTS MAY NOT BE ENOUGH AS THE CONSTANT HEAT CYCLING FATIGUES THE PARTS.