As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW RECEIVED LANDING GEAR NOSE DOOR OPEN INDICATION DURING CLIMB AFTER TAKEOFF FROM PHL. CREW RETURNED TO FIELD AT PHL AND LANDED WITHOUT INCIDENT. MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT. MAINTENANCE TROUBLESHOT AND FOUND DOOR ADJUSTMENT OUT OF RANGE DUE TO BROKEN LOCK TAB. MAINTENANCE REPLACED LOCK TAB AND ADJUSTED NLG DOOR LINKAGE AND PERFORMED OPS CHECK PER EMB AMM. A/C WAS THEN RETURNED TO SERVICE.