What was found
(CAN) AFTER TAKE-OFF, LANDING GEAR WOULD NOT FULLY RETRACT. NOSE GEAR CAME PARTWAY UP ONLY. GEAR WAS SELCTED DOWN AND LOCKED AND AC RETURNED TO BASE. HYD RELAY 947.09.26.112 WAS REPLACED, GEAR SWINGS CARRIED OUT AND AC RETURNED TO SERVICE. EVENING BEFORE, CREWS HAD COMPLAINED OF GEAR BEING SLOW. MAINT WAS INVESTIGATING AND IN PROCESS GEAR WOULD NOT RETRACT WHILE ON JACKS, A DIRTY CONNECTOR WAS TO HYD CONTROL RELAY 947.09.26 .112. CONNECTOR WAS CLEANED AND SYS OPERATED NORMALLY THROUGHOUT GEAR SWINGS.