What was found
ON FLIGHT 4291 (ICT TO MSP) HYDRAULIC QUANTITY NR 1 READOUT ERRATIC & INTERMITTENT. ON APPROACH INTO MSP RECEIVED GEAR DISAGREE. TWO MAINS NOT DOWN AND LOCKED. FOLLOWED QRH PULLED GEAR RELEASE HANDLE & GOT 3 DOWN & GREEN INDICATION. HYD SYS NR 1 READOUT TRANSFERRED TO DISC NR 2 THIS AML. VERIFIED FAILURE OF MLG EXTENSION SYSTEM. FOUND PLUG P5GA PARTIALLY ENGAGED. CONNECTED P5GA TO MLG SECTOR VALVE PER AMM 32-32-10 PERFORMED FUNCTIONAL TEST OF THE LANDING GEAR EXTENSION/ RETRACTION SYSTEM, NO FAULT FOUND. VERIFIED MANUAL RELEASE HANDLE STOWED PER AMM 32-34-00.