I think it is rather unlikely that relatively recent DEC machines had any asbestos in them.  Possibly some very old machines from the 1950's and 1960's might.  I know some old PDP-8's had mercury power contactors in them.  I can't imagine where one would use asbestos in a computer.  You mention tape drive braking mechanisms.  I don't recall ANY DEC tape drive that had a "braking mechanism", all control of the reels was done electronically.

Jon

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