The 270 V fault refers to the voltage that is used to bias the pin diodes in the T/R switch. That voltage is derived from the same transformer tap as produces the nominal 60 V supply. When I built my KPA500 kit I measured the voltage and found it was much lower than 270. Customer support told me that was normal and I have never seen a 270 volt fault.
I'd have no problem removing the top cover and holding the micro switch closed while I measured the actual voltage on the 270 V connector. I can't suggest that you do that. Perhaps a careful visual inspection of everything you touched when you had the cover off?
73,
Andy, k3wyc
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