Hello. I am having difficulty with selecting 1st/2nd gear. I have changed oil to MTL, still no improvement, so I want to remove the gearbox to check any binding on input shaft/clutch plate. Is there a write up on removing the gearbox in detail, and any adjustments to check for in the process. SLK 200 2003. compressor 2 ltr. 4 cyl. Thank you. Patrick.