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When loosening screws that have split lock washers underneath, the washer often turns with the screw initially and scores (or worse) the underlying copper earthing ring; earthing could be affected but also there may be copper 'filings' floating around the rest of the board.
I've just replaced the DSP board on K3 #145 due to a minor fault which only came to light after fitting the KRX3 (scratchy audio for 10 -15 minutes after switch on while the front panel warms up and which disappears when the aux dsp is removed - presumably a faulty aux dsp I/O on the main dsp board); I found I'd slightly damaged the mounting holes while removing the 3 metal pillars that support the aux dsp pcb.
If I was doing this for another reason which meant re-installing the main dsp board it would be much better in this particular instance to hold the screw still with a cross-head screwdriver and loosen by undoing the pillar on the other side with a nut driver; that way the washer should stay still and not scrape the copper ring.
Incidentally, dealing with Elecraft support was easy, efficient and totally painless. If only the rest of life was this good......
73,
Stewart Rolfe, GW0ETF
(Hoping to be C56/GW0ETF with the rejuvenated K3 late Feb/early March...)
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