Still an oldie but goodie - Akai AP-L45 issue

Hi all
New to the forum
I just purchased a Akai AP-L45 linear tracking turntable. I own one 30 years ago and always had a soft spot for them. I picked this up on e-bay at a good price and it seems to work great with 1 problem. Every now and then the tone arm sticks I can raise the arm and lower it again and it works fine. I'm assuming this is a lubrication issue as I doubt this thing has been serviced even though it was advertised as being such. My problem is I'm not sure how to service it and what to use.
Any help or suggestions are greatly appreciated.