Anybody Have A Marantz Professional CDR-500 Payer/Recorder? Having Issues


The right hand drawer, or main playback drawer is inconsistently reading discs. Some discs it will not read at all, others will take right away or will read after a second or third attempt.  I tried a cd cleaner disc to no avail. Any advice or tips before I breakdown and take it in?  Thanks.   
zar