As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF AND GEAR RAISED. "MAIN CARGO DOOR B" LIGHT ILLUMINATED. FOLLOWED QRH. DOOR LIGHT EXTINGUISHED RETURNED TO IND. DOOR LIGHT REILLUMINATED ON SHORT FINAL FOR 10 SECONDS. DURING T/S FOUND PIN B PUSHED BACK AT SW S9056 C/P D9834J. THIS IS THE GROUND WIRE FOR THE CARGO DOOR WARNING B SYSTEM. MCD AND MCD WARNING LIGHTS OP NORMAL. OK FOR SERVICE.