I opened my gearbox up carefully and had gears fall. I cleaned all gears and inspected looking for anything . then set out to figure oiut which gear went where. couple tries and done. greased it up with some hightemp grease. got it reinstalled quiet as a mouse for several hours. then loud noise it jams loud clank and now it sounds like loose ungreased roller bearings, still works tho. will inspect it next cleaning