05 Honda crv transmission question

I’m in the process of diagnosing my wife’s crv. It has roughly 180,000 miles on it. Automatic transmission 2wd. It has the whining noise from the transmission as well as shifting issues. I swapped out the 2 shift solenoids on the outer casing of the tranny as well as a fluid change, with no luck. I was guessing the transmission solenoid valve E (reverse and 4th clutch)that’s located on the side at the bottom with 4 other solenoids and a temp sensor that are covered with a small cover. There’s a harness tray runs into the cover that branches into all the solenoids. Is it supposed to be full of fluid?? I would imagine that with the harness sending a signal to those parts, being submerged with fluid might cause some shorting of some sort. Just curious!!