As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATB, RETURN TO JFK DUE TO GEAR DISAGREE AND GEAR DOOR MESSAGES AFTER GEAR RETRACT. C/W OW LANDING INSP. FOUND LMLG DOOR MTC ACCESS PANEL INTERLOCK MECHANISM OUT OF ADJ AND LT MAIN LANDING GEAR DOOR SAFETY PIN INSTALLED. REPAIRED AND ADJUSTED INTERLOCK MECHANISM. MLG DOORS OPS NML.(7547412)