What was found
AFTER TAKEOFF GEAR DISAGREE EMERGENCY AFTER GEAR SELECTED UP. GEAR WAS INDICATED 3 GREEN THE WHOLE TIME. WE RAN THE EMER CHECKLIST AND GEAR REMAINED 3 GREEN. DIVERTED TO RDU. FOUND TARGET FOR PX37 MISSING. INSTALLED TARGET PER CRJ 900 AMM 32-61-05. PERFORMED OPS TEST OF LANDING GEAR PSS PER CRJ 900 AMM 32-61-00. OPS TEST GOOD. C/W GEAR SWINGS PER CRJ 900 AMM 32-30-00. PERFORMED 3 GEAR SWINGS WITH NO DEFECTS.