What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) PIC reported that during his approach to land he positioned the landing gear selector handle to the down position and heard a "thump" during the opening of the gear doors. After the main gears extended normally the left main gear door failed to retract to streamline and began to impact the bottom left fuselage area near the baggage compartment door, causing minor skin damage. Further investigation of the aircraft records revealed that three days prior to the incident a welding repair was accomplished on the landing gear door, the weld did not hold causing the door to come loose at the attachment door.
As the FAA filed it
(-23) PIC REPORTED THAT DURING HIS APPROACH TO LAND HE POSITIONED THE LANDING GEAR SELECTOR HANDLE TO THE DOWN POSITION AND HEARD A "THUMP" DURING THE OPENING OF THE GEAR DOORS. AFTER THE MAIN GEARS EXTENDED NORMALLY THE LEFT MAIN GEAR DOOR FAILED TO RETRACT TO STREAMLINE AND BEGAN TO IMPACT THE BOTTOM LEFT FUSELAGE AREA NEAR THE BAGGAGE COMPARTMENT DOOR, CAUSING MINOR SKIN DAMAGE. FURTHER INVESTIGATION OF THE AIRCRAFT RECORDS REVEALED THAT THREE DAYS PRIOR TO THE INCIDENT A WELDING REPAIR WAS ACCOMPLISHED ON THE LANDING GEAR DOOR, THE WELD DID NOT HOLD CAUSING THE DOOR TO COME LOOSE AT THE ATTACHMENT DOOR.