After I first recapped cards "where necessary", I have now started to do the entire console, channel by channel. All while the console is being used. Basically, the channels in the last bucket (41-48) are taken out, and whenever a complete channel is serviced and rebuilt, I swap it out against one in use.
I am not only recapping, but also, taking out the routing cards to bath them in Isopropylalcohol (for a few days). I also clean the surface of the entire channel motherboard (again with Isopropyl) from dust, and all the card connectors with Q-tips. After cleaning the motherboard gets waxed and polished (using a high quality car wax) for future protection. After recapping the cards I clean them with a soft toothbrush (and, guess what LoL) and also clean the edge connectors with a Q-tip.
This is very time-consuming when doing it to this level of perfection. Probably takes 3-4 hours per channel. I like to think that after this treatment the channels are better than new, considering that todays caps are of much higher quality than 20 years ago, and I am using very high quality caps.
Picture below:Film Pan MK2 Card and G-Series Logic card (note the little red 0,47uF WIMA MKS Film Cap replacing an Electrolytic Cap).
On the Film Pan MK2 Card I have increased the value of the Non-Polar Cap to 100uF and installed a MKP Film-Cap as a bypass. The Film Pan MK2 Card would measurably cut off the low end which is an effect of the value of this cap being too small. Interestingly I don't see this low-cut on some of my channels that have the Film Pan MK1 Card installed.
The Film Pan Card is pretty much an added circuit at the end of the channel signal chain, that all the Non Film Pan-Consoles do not have. I might do more modifications on it, these are not the most clever design.
VCA Card (top left) on which I increased C9 to 220uF and added MKP Bypass-Caps 0,01uF on C8 and C9 (soldered to the back of the PCB)
G-Series Channel Amp Card (top right) and Dynamics in the front.
Group Card (top) and G-Series 292 EQ (front)
The routing cards are not making any noises any more. I've also cleaned the grey routing buttons in a soap bath and then bathing in plastic cleaner (for car interior) which softens them slightly. A lot of the routing cards on my console were previously replaced (probably in 2008), and cleaning those newer cards was probably more of esoteric value.