Hi HH,
I've got a similar Q with my 2315. There's almost no tension on the cable connected to the spring that is says to tighten in manual when blades aren't engaging (see pic)
View attachment 52311. Is this a similar issue to yours? Did it end up being the vacuum system? The cable runs into some sort of tank just underneath the bodywork/seat on the right side. Is that part of the vacuum system?
The belt doesn't really get going at all when I slide the cutting lever up to cut and the blades seem unable to engage. Just wondering if this is a possible self-fix for an amateur. Trying to get a service at the moment aint easy. Thanks