Cold Sweat ...James Brown!
Fortunately I have Nick & other friends to help render "objective" opinions on any problems!
One late night I was working on a long time clients project from New Orleans, when I saw the lights go dim & the needles slowly drop on my Manley Vari Mu, sound faded out. WTFluke? Fortunately I had another MVM in Studio B which I grabbed to finish the EQ work. The next day I had Nick call Paul at Manley service who diagnosed ove the phone. Turns out a big cap in the power supply had gone south, after 10+ years service. They had the part up at Fry's Electronics in north Austin, a 35 mile round trip in moderate to heavy traffic. The next day it was all fixed and back in service. WooHoo.
So I was able to rely on my right hand man & consult with an expert to get it solved quickly. Whew!
Actually the very next day we both had a full sessions, I did mine without the Manley, just the Rupert Neve MBP which handled the job beautifully.
So having backup plans in place, and a team of those ready to help was invaluable in this case.
When your livelihood depends on steady flow of work, it's good to have for peace of mind.
So I have alternate systems available, spares, should the need arise; speakers, power amps, DAWs, etc
Helps me to sleep better.