A real sense of achievement today for me, and some of you may roll your eyes. I had an annoying problem on my RFM, centre right martian was not being activated, so thought dodgy reed switch, so out with the PF and with my trusty Fluke DVM that i have not used since i was a Canon field engineer I started testing. Switch all OK, bugger, thought it was going to be easy fix. Out with the PDF of the manual, and time to tackle the switch matrix, at that point i thought hmmm....time to google "how to read a switch matrix", a couple of websites and Youtube video later i got the concept. So i thought lets see if the fault is on the PF, before it reaches the power board. OK, so clean all connectors, plugged in same thing, hmmmm, now what. Lets start tracing from each of the switchse in the row, started from the wrong end, so nothing between the middle target and the connector on the PF. Try next one...nothing, ok, lets start on the left hand side...checked between left outline and left return switches....nothing...ok its blu-wht wire...gave a little tug...oh look although it looked connected, it wasn't. Out with the soldering iron, and solder, re connected, checked from switch back to target bingo, checked target to connecter....bingo! Slid it all back in powered up....beautiful!!!. Second job, replace the batteries attached to my DE SW with a battery pack that keeps it well away from the board, i've seen the damage that can do, and apparently these boards are more rare than rocking horse poo. OK, these maybe routine things for you workshop boys, for me that has not done this for 30 odd years, it made my day.