What was found
(CAN) POWER LOSS FIRE DEPARTMENT, PT6T-3D, S/N TH0360, TTSN 2102, TCSN 3040 DURING A CHECK FLIGHT FOLLOWING RGB 2500HRS INSPECTION, WHILE FLYING LEVEL AT 500` THE NR 2 ENGINE TORQUE DROPPED TO IDLE UNCOMMANDED. THE OTHER POWER SECTION TOOK THE FULL TORQUE WITH NO EXCEEDANCES AND THE PILOT WAS ABLE TO SWITCH THE NO. 2 TO MANUAL. THE ENGINE PERFORMED NORMALLY IN MANUAL FOR THE REST OF THE FLIGHT. SUBSEQUENT GROUND TESTS IN AUTOMATIC FOUND THE ENGINES WORKING NORMALLY, TROUBLESHOOTING IS ON-GOING.