What was found
(CAN) LEFT MAIN GEAR FAILED TO EXTEND AFTER SEVERAL ATTEMPTS. GEAR MANUALLLY EXTENDED AND AIRCRAFT LANDED OK. INSPECTION REVEALED THAT THE UPPER DRAG BRACE PIVOT BUSHINGS WERE PUSHED OUT TOWARDS THE UPPER DRAG BRACE BINDING THE BRACE AND PREVENTING IT FROM ROTATING FREELY. IT IS SUSPECTED THAT THESE BUSHINGS WERE PUSHED OUT FROM THE FORCE OF OVER GREASING THE PIVOT PIN.