What was found
ON FLIGHT 3735 THE CREW REPORTED THAT AFTER TAKEOFF ALL THREE LANDING GEAR WOULD NOT RETRACT WITH GEAR HANDLE UP, GEAR DISGREE WARNING WITH GEAR HANDLE DOWN PROXIMITY SYSTEM 1 FAULT. PERFORMED EMERGENCY PROCEDURES AND DECLARED AN EMERGECNY IAW CRJ AOM VOL 1. RETURNED TO CLE AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS REMOVED FROM SERVICE. TROUBLESHOT SYSTEM PER FIM TASK 32-60-00 PERFORMED OPERATIONAL TEST OF LANDING GEAR PPS IAW CRJ 700 AMM 32-61-00 NO DEFECTS PERFORMED FUNCTIONAL TEST OF PSEU FAILED FNC REMOVED AND REPLACED PSEU IAW CRJ 700 AMM 32-61-01 OPC AND FNC GOOD PERFORMED NORMAL OPC OF LANDING GEAR EXT/RECTRACTION IAW CRJ 700 AMM 32-30-00. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.