What was found
ON FLIGHT 3250 THE CREW REPORTED THAT ON TAXI-IN, INTPH 2 CB POPPED (33B). THE CREW NOTICED AN ELECTRICAL BURNING ODOR. THE AIRCRAFT WAS REMOVED FROM SERVICE. CHECKED WIRE HARNESS' BEHIND GLARESHIELD PTT SWITCH, F/O HEADSET JACK PANEL, #2 ACP. NO EVIDENCE OF BROKE WIRES, NOR BURNT INSULATION, NOR ARCING. ABLE TO RESET CIRCUIT BREAKER (33B INTPH 2). BENT AND TWISTED ALL WIRE HARNESS' AND CIRCUIT BREAKER STAYED-IN. FIRST OFFICER’S AUDIO SYSTEM OPERATIONAL CHECK WAS GOOD IAW AMM 23-51-00. THE AIRCRAFT WAS RETURNED TO SERVICE.