Yeah they lift at the back, but not at the front. Having said that, the plug-in screw was stubborn af too. Will persist in a non-Big Clive manner.
Be careful those early boards are quite fragile (one in my 5243L was cracked across the connector area), I think the cards are the correct ones, would be very obvious if later ones had been fitted.
I can probably help with transistors for the 5245L-4B card, I bought a lot of cards from Sphere (minus tubes) for the decoder assemblies.
You will probably need to replace all the decimal point neons, as they remaining working ones will snap off (copper plated
steel rust wires) when the assembly is removed.
Would it not have replaced the 524 counter? as that is the only older one with an eight digit display, I'd post a picture but I think they are trapped on my old HDD*
*Got to catch-up again, computer is now rebuilt, minus transferring the stuff from the old HDD's, currently 55% of the way to format the new 4TB HDD.
The build got delayed by a day, due to me not noticing the new Mobo was larger & needed more hex spacers, plus the gorrilla that built the machine in 2008 split one of orginal spacers forcing a longer screw in, as well as another one that had a metric screw forced into #6 UNC hole
, thankfully the local PC shop in Nantwich had some hex spacers in their spares box
.
David