Are the only connections not to get a routine disconnect after equipment repositioning, rack moving etc
I did a rack rebuild and stacking order change some weeks back and thought I’d covered all connections and it’s just occurred to me tonight that the link plug in “Upgrade 2” on my 82 has never been unplugged.
Job now done 
When I bought an olive pre/power amp years ago, the dealer recommended that I opened up the case once a year, lifted the boards out and pushed them in again to clean the contacts. So I guess the link plugs might be worth a try.
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