DEC R80 HDA details

[shadoooo]

Hello,
I'm in the process of cleaning and hopefully restore to operation of a DEC
R80.
The unit has some minor sign of corrosion, however it's VERY dirty, even
inside the hood.
The filters are obviously to be removed and replaced, as they are
disintegrating.
Also foam parts between the boards must be replaced.
Aside from obvious parts, there's something that should be replaced /
cleaned inside the HDA (foams, filters or rubbers), which could damage the
disk permanently in case it's turned on after decades if not "cured" before?
Anybody has some good pictures of the HDA inside, after cover removal?

Thanks
Andrea