I got some 220pf 0402 caps and some 560 ohm 0603 resistors. I plan to try changing C274, and R45 + R46 for these on one of my K16s to see if it brings it to life.
Well, it seems I failed to get the right resistors, and I've got 560 mOhm resistors.
Fortunately I noticed this before I installed them.
I did measure the resistor I removed, and it measures 1001 ohms, so the "mod" has not already been done to mine.
I've got some actual 560s on the way now.