What was found
PILOT REPORTED M/R DROOPING OFF WHEN POWER IS APPLIED. RECORDS SHOWED GOVERNOR NEAR T/X FOR O/H. SUSPECT GOVERNOR WAS REPLACED, GROUND RUN AND LEAK TESTS WERE PREFORMED ALONG WITH A SATISFACTORY TEST FLIGHT, ACFT WAS RELEASED, RETURN TO SERVICE, 1.5 HRS LATER THE PILOT AGAIN REPORTED M/R DROOPING. MX RETURNED AND CHECKED FOR ANY CRACKED OR BROKEN AIR LINES, INSP FOUND NO ANOMALIES. ACFT WAS THEN STARTED AND THE SYS WAS SNOOPED CHECKED FOR AIR LEAKS, A LEAK WAS DETECTED AT AN ACCUMULATOR THAT IS BOLTED TO THE TURBINE FIRESHIELD. ACCUMULATOR WAS INSPECTED AND A SMALL CRACK WAS FOUND ON THE BOTTOM SIDE OF WHERE THE FITTING IS ATTACHED TO THE ACCUMULATOR. THE ACCUMULATOR WAS REPLACED AND THE ACFT WAS RETURNED TO SERVICE.