[Test-Equipment] Eaton 380KII

[Glenn Little WB4UIV]

Does anyone know a source of service information for Eaton 380KII 
signal generator?
I picked one up at the Shelby hamfest with the 2GHz and 180 MHz plugins.
The mainframe shows signs of having been worked on, missing covers 
and missing hardware.
Any help appreciated.
The only source that I found wants $500.00 for the service manual.
This is a thirty year old signal generator based on component date codes.

Thanks
73
Glenn
WB4UIV