I have a John Deere walk behind, JS46 (2010-2011). The tranny (rear wheel) is fine now but since this mower is no longer being made, parts are becoming few & far between. I'd like to open up the tranny and check the grease situation & probably clean & re-grease like I do on my Toro's. I have had it out & removed all the torx screws but the case is stuck tight. I have attempted to pry it with a small screwdriver but am afraid if I jam the blade in too hard I will break the case. I guess the maker, General, considers this unit "not serviceable." But why then the screws? Anyone ever split one of these open?