Keithley 2000 2015THD

Hello,

I have two flawn Keithley multimeters:2000 and 2015THD. For the 2015THD I would need the content of the two memories of 27C020 ( U156 , U157 version B07 ). It starts when I put the memories from 2000 but i don't think it is working in the normal parameters...where could I find the memory content? I am willing to trade the Keithley 2000. For the Keithley 2000 I have found the following errors when I run an internal test:
101.2
101.3
200.1
200.2
201.1
201.2
300.1
301.1
301.2
302.1
302.2
303.1
303.2
304.1
400.2
401.2
402.2
403.2
500.1
500.2
600.1
600.2
601.2
Do you think that there is a possibility for reparing the Keithley 2000? Maybe with a scheme...but I didn't find one! I could really use some advise from more experienced peers in the field!

Thank you very much!

Costas