What was found
STL - AFTER TAKEOFF RIGHT MAIN LANDING GEAR UNSAFE LIGHT REMAINED ILLUMINATED AFTER LANDING GEAR RETRACTION, AND LANDING GEAR DOOR OPENED DURING UPLATCH CHECK. FOUND DOOR LATCH MECHANISM, MFG P/N 5915169-5506, WOULD NOT ALWAYS ENGAGE DOOR ROLLERS. RIGGED DOOR LATCH MECHANISM. LANDING GEAR DOOR AND LIGHT INDICATION CHECKED NORMAL.