What was found
GEAR DISAGREE MESSAGE AFTER TAKEOFF. CREW FOLLOWED THE QRH AND RETURNED TO ORF. FLIGHT LANDED WITHOUT FURTHER INCIDENT. THEY DID LAND OVERWEIGHT AND ALSO DECLARED AN EMERGENCY. THEY DID NOT HAVE THE CABIN BRACE. REMOVED AND REPLACED PSEU IAW CRJ 900 AMM 32-61-01-000/400-801. POWERˆ’UP TEST OF THE LANDING GEAR PSS SYSTEM GOOD AT THIS TIME. PERFORMED 8 EXTENSION AND RETRACTION CYCLES OF LANDING GEAR. ALL CHECKS GOOD AT THIS TIME."