What was found
GEAR DISAGREE MSG DURING RETRACTION. AFTER 28 SECONDS, NOSE DOOR MESSAGE AFTER EMERGENCY EXTENSION HANDLE. HYD PUMPS IN AUTO DURING INITIAL MSGS, THEN SELECTED TO "ON" DURING QRH, NO ICE OR TURBULENCE DURING EVENT. JUST NLG BOX SHOWED RED. AIRCRAFT REMOVED FROM SERVICE. NOSE LANDING GEAR PRIORITY VALVE FOUND TO BE INTERMITTENLY WORKING. REMOVED AND REPLACED NOSE LANDING GEAR PRIORITY VALVE IAW 32-33-15-04 AND PERFORMED OPS CHECK IAW 32-30-00-00-730-801. OPS CHECK GOOD FOUND NO LEAKS, NOSE LANDING GEAR EXTENSION/RETRACTION RETURNED TO NORMAL OPERATING CONFIGURATION.