Restoring old Krell KSA-50 Ser. 1087.Whats recommende

Bought an older KRELL KSA-50 Serial (1087) which will need cleaning and restoration,
Will need re-cap but what else should I do to get the most out of it for some years?
Best type of fan replacement if needed?

What was changed in the Mk.2 version?
Well used to soldering and building DIY stuff but what are your top recommendations from the vast experience here.
I know they get warm but I like the class A sound. All advice welcome.
Thanks
Liam
 
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Krell KSA-50

This Krell KSA-50 should be arriving this week.
Have read nost of the Krell threads but would still more than welcome any advice
please. I don't want to wreck this beautiful amplifier.
What are the components that really need replacement given its age.
Is there a better fan than the original?
What is the recommended bias?
Again thank you all
Liam