What was found
OPENING THE MAIN CABIN DOOR, AFTER LANDING, BITS OF THE MAIN HINGE BROKE OFF. TECHS WERE UNABLE TO REMOVE THE DAMAGED HINGE HALF AS THE HINGE PIN IS FULLY SEIZED. REMOVED SUPPORT BRACKET & INSTALLED NEW SUPPORT BRACKET REMOVED DAMAGED HINGE HALF & INSTALLED NEW HINGE HALF. REMOVED SEIZED HINGE PIN. INSTALLED NEW HINGE PIN. PERFORMED OPS CHECK OF MAIN ENTRANCE DOOR. NO DISCREPANCIES NOTED. ALL WORK PERFORMED IAW AMM 52-10-20 & SRM 51-40-08.