Yamaha CT 610 II tuner

I have an old Yamaha CT 610 II am/fm tuner. I note that the signal post (what do you call it?) is not quite accurate. When tuning to FM station 95.7 the post is showing right about 96.1. What is required to adjust an analogue old fashioned tuner and the approximate cost for an experienced tech?
ahh, the dreaded string slip.... a have a vintage sansui, that did the same on the freq.indicator, DON"T FEEL SPIN the tuning knob to the min/max. an easy diy fix...
I have same problem,did you have schematic of this tuner ?
Merci: Gilles loiselle