HP strange (for me) device

Marcello Pellerano

Hello all,
I've a strange question, a bit out-of-topic too, since it concerns an HP instrument, the 3585A spectrum analyzer.
My unit has the +5V regulator board damaged, I think that the power device is faulty.
This is a strange TO-3 component, but with three pins (instead of two as usual).
The HP part number is: 1813-0082.
Could somebody please tell me what kind of device this could be?
For the same reason, is there any site from where I could download the service manual?
Thank you in advance
Best regards
Marcello - Italy

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