Greetings - I am new to R2R but I am getting into it and would love to learn more. My first unit is a Sony TC-255 I picked up locally. I realize this is a bottom of the line unit... but, hear me out. It's super clean inside and out. (I think? Picture attached.) It was playing and working well... for about a week. I was listening to a reel when I physically heard the speed slow down. Now it seems to be constantly playing at this slightly slower (but obviously wrong) speed. I thought OK - maybe need to change the belts. ...but after a belt replacement, still playing at the same incorrect, slower speed. Any thoughts? It's a great little machine... i'd love to get it working properly again. Any advice would be greatly appreciated.