What was found
AFTER A ROUTINE FLIGHT AFTER LANDING, STOPPED ON THE TAXIWAY AND RETRACTED THE FLAPS THEN TAXIED ON WHILE S-TURNING. ACFT WAS APPROXIMATELY TWO-THIRDS THE WAY DOWN THE TAXIWAY WHEN THE LEFT GEAR COLLAPSED PUTTING THE WING TIP AND PROPELLER INTO THE GROUND. INSPECTED THE LOCK-PIN ON THE LEFT SIDE, IT WAS RETRACTED, THEN INSP THE RIGHT GEAR AND FOUND THE LOCK-PIN OUT AND LOCKED. WHILE LOOKING AT THE LEFT GEAR LOCK-PIN NOTICED IT WAS SLOWLY WORKING ITS WAY OUT INTO THE LOCKED POSITION. ON LATER INSPECTION, PUTTING THE AIRCRAFT ON JACKS THE GEAR-LOCK MECHANISM FUNCTIONED PROPERLY. UPON REMOVING THE LOCK-PIN AND SPRING, SMALL FLAKES OF HARD CHROME WERE DETECTED FROM AROUND THE AFT OF HOUSING-BORE AND LOCK-PIN.