HP spectrum Analyzer 8591E

[Talli]

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I bought this HP spectrum analyzer model 8591e few years ago... Wanted to learn how to use it... When I was putting together fm radios... I'm still learning how to use it...
It has a tracking generator and the frequency range of the analizer is 1mhz to 1.8..Ghz
When I try to do the self calibration (frequency and amplitude)... It fails the amplitude test... The message
Cal res band width amplitude fail... Srq110
Does any one knows where is the issue??.. Worked on a unit like this. What stage... Is bad components are bad.... It's a beautiful machine would love to fix it.e

Sincere