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I'm not sure on OE spares.
Depending on whether it is belt drive or direct drive, it could be as simple as fitting a new belt &/or giving the bearings a service (clean, lube etc).
I had mine done by this guy - http://liquidaudio.com.au/
He cleaned the chassis, lid, tonearm, platter and mechanism, lubed the mechanism, motor and spindle bearing, fitted a new belt, repaired a crack in the tone arm, replaced the mains suppression capacitor (which was cracked), adjusted the sub-chassis suspenson, set the alignment and adjustment on the arm lift and fitted the new cart. Most of those things aren't that difficult to do but given its age and that it had been in storage for over 10 years, I thought it best to get him to deal with it. Was well worth it.
Maybe try and find somone similar local to you and see what they say.
how much did it cost if you don't mind me asking?
this is the one we have, seems to review well.
http://www.hifi-classic.net/review/thorens-td-115-mkii-314.html