Keithley 2000, preventive maintenance or don't touch it till it fails?

[Zorc]

I've recently got a Keithley 2000 from the year 2000 with its last calibration 2 years ago and seems perfectly fine as far as I can check at the moment...

Popped the hood, noticed nothing weird.

However it has a few electrolytic capacitors from Nichicon (datecode also year 2000) which look perfectly fine visually (no bulging, leaking or whatsoever).

What is recommended, leave everything as it is and use it till it fails or should I do some preventive maintenance on it?
The outside could use some cleaning for sure
Is it wise to replace those caps at this time or not? I've replaced failed caps before on other devices but never on a old test test equipment.

Any other recommendations are welcome as well!

[z01z]

There are a lot of topics about those caps leaking in Keithley 200x meters.
It is your time and money, but once that goo is out, it'll eat PCB and components alike, and it'll be much more effort to repair the damage than a simple component swap.

[coromonadalix]

If you have good soldering skills  do a preventive maintenance, but be careful  its a precision instrument, antistatic counter measures should be applied,  you have to use the right equipment for desoldering ... clean the board for solder residues when the new caps are in place etc ... you get the idea.

[Zorc]

Yeah, being it a precision instrument is kinda my dilemma.
Not touching it seems the best if not needed even while I'm sure I could swap them out just fine...

I've also heard bad things about leaking caps in Keithleys causing damage, no idea for which production years this happens though.
However, most caps I've replaced in other electronics didn't really leak goo or maybe just a tiny drop not causing pcb damage.
So I'm not sure if we are talking about a few isolated cases or that there is a significant risk for things to go bad.

Would it be safe enough if I keep an eye on them to check for bulging/leaking signs?

[coromonadalix]

Sure   

[voltsandjolts]

Yeh, replace the caps. Take your time and you'll do fine.

https://www.eevblog.com/forum/repair/2x-keithley-2000-repair-log/

[bdunham7]

What series are the capacitors?  Just post closeup photos if you can't decipher them.

It looks like an easy job, just make sure you get top-quality replacements.