Hi Peter
This might help a little but I’m no techy. When I had my 26500 the drive belt was removed several times on visits by engineers and from what I could see was not very hard to remove but much more fiddly to put back and on several occasions I had to hold part in place when they attached the other end.
Again from memory there is 3 service levels, A B & C, C service is first and is basically all the waste pipes and filters etc. Never had a b or a but Im told A service basically replaces everything that moves or has ink through it and a B would be between the two.
From memory a C service cost me aprox £380 in parts and 1.5hrs time to fit, never had the next ones. The web server status page should tell you what % you are through each service giving you an idea when its due.
Sorry its sketchy but give you something to think about until someone gives you the full details.
Kev