@gstuart, i have already dismantled both left and right rocker panels and sills, and while there is evidence of water having been there, it's all bone dry. the right side houses several crappy splices, which the window control was completely toasted, but everything else seems fine and like i mentioned, i've splayed them out by hand and don't see anything currently wet, or apparently corroded.
i will inspect the fuse box. i've read several other threads where people resolved their woes by finding loose or corroded connections at the TCM, the HVAC, or other stupid places.
circling back to the trouble codes, i only get the laundry list of codes after a panic mode session. i will do a full clear (as full as i can, the EVO seems to be unable to remove codes from Front Lighting Module and sometimes EPB module), try to kick on the air suspension, and retest. many times i do that, i only get the reservoir code.
i've checked (and checked again) the plumbing at the reservoir valve block, but i haven't had a look at the front or rear block. i do not suspect an air leak in the system, as the truck is sitting VERY low, but NOT on the bump stops, and it hasn't lost a centimeter in the two and a half weeks i've owned it.
i do have sunroof, and we had a rainstorm of biblical proportion and i went out to the car in the midst of it and couldn't locate any ingress AT the sunroof, or on the floors... possibly behind the dash and got sopped up before it made it down to the floor, i'll have a look. going to go back to working on the truck as soon as i've finished my honey-do list for the day
Great many thks so can see what stage ur at , there are those 2 x modules behind the battery that can get wet or dirty / missing pins
Fingers crossed will be something daft