Unless it’s been heavily used & abused it should be fairly maintenance free for 3-4 years.
My Summa D120 was working as good as day one and although going through a ton of blades and 1 holder (disintegrated) was spot on (5 1/2 years)
If you are handy with a screwdriver – blow the dust out of the casing & use an appropriate lube for the moving parts (pulleys, pivots etc.) DO NOT just ‘skoosh WD40 all over it’ – if it’s got old grease showing…grease it with high performance grease.
New cutting strips are available from most retailers / distributors of the machines as are blade holders…anything more indepth & normally it’s a return to manufacturer for an overhaul…but £££ will be flowing from your pocket.