If the risk of failure inherent to a decades-old mechanical device gives you anticipatory anxiety and curtails your enjoyment of the music, then buy new. If on the other hand you’re like, I’ll just buy another one if this one craps out, or if you or someone you know is able to fix it, then buy old.
It all goes down to knowing yourself and what makes you happy :)
Old Marantz players used Philips transports, back when Philips owned Marantz, and later they did develop their own transports. Personally I would avoid proprietary parts that make you 100% dependent on a single supplier. Major transport makers (Phillips, TEAC, Sony, etc.) usually have major wear parts, or even entire transport units, available to this day.
CDM-family Philips transports are very well built and quite reliable.
There are several units listed on eBay but, caution, some are 230/240 volt Japanese market units.
Power in Japan is 100V
And from the senseless nitpicking dept.:
I left the world of transports and cd’s when my wonderful Mark Levinson No.37 (Phillips Pro mechanism) died.
@sns Mark Levinson No. 37 use a CDM12IND transport, not the later CD-PRO. At least, mine does. Wonderful piece of kit indeed.
By the time No. 390s came around they may have switched to CD-PRO.