Hiya Tim,
This is my 6th Citroen having owned a ZX, BX and 3 Xantia's and I think they are brilliant cars, it's just all the wee niggly problems that crop up that sometimes get you more than anything major....
I haven't had a chance to look yet, I found another post on here that says you can access it through the rear light mounting but it seems it can be a bit of a bu**er of a job to get into it..
I'm afraid that with the way my hands are with arthritis that anything invloving stuff to fiddly is out of the question... I can cope with stuff out in the open or a fair amount of room around it but get into enclsed spaces is getting impossible, it took me all my time to get into the fuse box to pull a fuse
Peter