What was found
(CAN) ON TAKE-OFF THE CREW REPORTED THAT THE LT ENGINE EXPERIENCED A POWER LOSS AS NOTED BY A REDUCED MANIFOLD PRESSURE AND RPM. VISUAL INSPECTION OF THE ENGINE, FUEL SYSTEM, IGNITION SYSTEM, INDUCTION SYSTEM, AND COMPRESSION CHECK DID NOT REVEAL ANY OBVIOUS CAUSE. THE PROBLEM COULD NOT BE DUPLICATED WITH EXTENSIVE GROUND RUNS. THE PROPELLER GOVENOR WAS SUSPECT AND WAS REPLACED. THE AIRCRAFT COMPLETED A LOCAL CHECK FLIGHT WITH NO FAULTS AND ALL ENGINE PARAMETERS WITHIN NORMAL OPERATING RANGE.