What was found
RDU - FLT 5142 - ON FLIGHT 5142 FROM RWI TO CLT, THE LANDING GEAR WOULD NOT RETRACT. AIRCRAFT DIVERTED TO RDU. AIRCRAFT LANDED WITH NO OTHER PROBLEMS. NO IN-FLIGHT EMERGENCY DECLARED. MAINTENANCE FROM CLT WAS DEPLOYED TO RDU. LANDING GEAR WAS INSPECTED AND FOUND THE EMERGENCY HYD SELECTOR GEAR RELEASE PIN POPPED. RESET PIN AND OPS CHECKED GEAR. AIRCRAFT RETURNED TO SERVICE. (X)