Transmission not shifting properly

I was driving and all of a sudden, I lost 3rd and 4th gear. I have all other gears prn12. It takes off in 1st and shifts to second normally. When it shifts to third it revs up the engine, if I let off it will go into 4th and the same thing happens. If I manually shift from 2nd to 3rd it takes about 1.5-2 seconds for it to shift. If I feather the throttle, it will gain speed but if I press the accelerator hard it just revs the engine. The fluid is a little darker than original but not much. I’ve always had it changed at factory recommended intervals. It probably has 40,000 miles on this change. It doesn’t smell burnt at all and the fluid level is correct. Everything I’ve read first points out that it has to be the 3-4 clutches. I’ve done a line pressure check and all the gears are within tolerance using a Snap-on solus pro. I can manually engage the shift solenoids and hear them click. With the engine off I can hear the pcs make a high-pitched noise going from.01A-1A. No trouble codes have been set. I’ve put it on jack stands and cycled it through the gears. It will shift through all the and bring the speedometer up. Recently I pumped fluid out and replaced it with resnor stop slip and two quarts of fluid. It has helped a little. I haven’t pulled the pan or changed the filter. Also, I can’t reset the transmission adapt with the scanner. Are there any procedures I can do with the scanner to help further the diagnosis? Also, when in drive if I turn the TCC on it will stall out the engine in 1 or 2 seconds.