Oh! You bring me memories of the SL-5, which was offered to me while my hunting days; albeit priced much more.
I believe Technics linear trackers rely heavily on a heap of ICs placed inside. Also, inherently they are much more complex and are real pain to fix (in case they are fixed!). A lot of old linear trackers are biting dust & sand because of unavailability of parts, esp the ICs. They had their own charm once, but probably as a fad. The better ones were obscenely expensive, if I am correct. Some linear tracker models could read even the tracks and play a specific track on the record as per the user's command. There are some advantages of these TTs like less tracking error, no need for anti-skate etc. But a properly balanced, aligned pivoted tone-arm comes very very close, hence never a deal breaker.
But going by the hassles, my suggestion will be in line with Reuben & Kuruvilla sir. Stay away even if it is playing fine currently. You never know when the electronics may fail.