Hi and welcome to Beoworld!
The Service Manual is indeed available on the Main Web Site ‘Products’ link (site for Gold and Silver Members) here: https://beoworld.org/manuals_view.asp?pid=1275
The fault finding in the service manual is limited to: No display; No sound:; and no IR transmission, but it should help you dismantle (carefully!)
I think I remember the thread that you mentioned but it is most likely on the previous forum that we can’t currently access. It’ll be back eventually I am sure.
I wouldn’t want to take a Beotime apart without further advice/photos!
