PS Audio Lambda transport making a 'tick tick tick' sound when playing CDs

I’ve got an older PS Audio Lambda transport that developed a “ticking” sound the other night.  It started out really subtle, very minor ‘tick tick tick’ type of sound along with the music that grew a little louder as the track progressed.  It was a fairly long CD at ~78 minutes – I know some of these older transports don’t like the longer discs.  I tried a different transport and it wasn't there, so it wasn't on the source disc.

Any idea what that might be, and if it’s fixable?  I really like this transport because the digital display is much larger than most and it’s easy to read from across the room.  Who still works on these types of units?