One dealer website ..
For best performance, an LP12 should also be regularly fitted with a new belt, oil charge, and suspension springs and grommets, and be ‘tuned up’. A tune up includes having all fittings and connections examined and tightened, tonearm and cartridge checked for correct alignment and operation, and the suspension calibrated for proper isolation and performance.
How much of this is real or marketing? I dunno, but it makes sense to me and I've been happy getting these tune-ups done. I think its a relevant consideration for the OP in deciding how to handle this question.