Mitutoyo DRO

I bought a used mill a while back and it has a Mitutoyo DRO model
"PM-32L". I think it is about 10 years old I guess. Does anyone know
where I could find the users manual or any other useful documentation?
I hope I never need parts for this thing! A picture of it can be found
at:

http://webpages.charter.net/aprs/misc.html

Thanks.

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