An old Miele giving problems spinning?

I have an old Miele Novatronic W919 WPS(it must be around 20 yo)

I noticed a fault when I set it to spin only and it only wanted 1 minute instead of the usual 7 and went to zero without spinning at all.

I got around the problem by setting the spin speed to a higher number but I suspect there may be a problem with the software

Is it possible to just fit a new "motherboard" and does that sound like an expensive job for a Miele engineer?

I am loathe to buy a new machine but might I need to prepare for that possibility?