I purchased a Marantz CD63 Ki with a draw not opening fault with the intention of modding it. On arrival I found the unit had been damaged in the post and while I could get the draw working by putting the belt back on, the laser travel mech was broken. So I replaced the whole laser optical head mech with an OEM VAM1202 from CPC. Since fitting this most times on inserting a disc it does not spin but twice a motor can be heard. Sometimes it does spin a disc but only for a few seconds and once it got as far as a TOC. In service mode I can run through the checks with no problems apart from the spindle movement in modes 2 and 3, which will run sometimes but not others. I have taken the whole transport out and replaced it with one from one of my other cd63 and the player works fine. Any ideas?