As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT 880 ON FLIGHT 5008 FROM CLT TO OAJ. AFTER TAKEOFF THE LANDING GEAR WOULD NOT RETRACT. THE AIRCRAFT RETURNED TO CLT AND LANDED WITH NO OTHER PROBLEMS. NO INFLIGHT EMERGENCY WAS DECLARED. WHEN THE AIRCRAFT ARRIVED AT THE GATE THE ALTERNATE GEAR EXTENSION PANEL WAS FOUND OPEN. PANEL WAS CLOSED, SYSTEM OPS CHECKED NORMAL. AIRCRAFT RETURNED TO SERVICE.