A/C issue and codes P0700, P0727 and P0742

I went through the steps I found on here to troubleshoot my A/C which has several issues but I'm stuck.

Four years ago I had the A/C professionally serviced and repaired, drove it long distance a few times and then it sat for a few years mostly unused. So I expected the A/C to still be working this summer, but no.

Problem #1: Blend Door actuator Fail (no air blowing out).
-Took the actuator off and manually and opened the door.

Problem #1.5: Fan Speed Settings 123 do not work.
-Assuming it's the resistor pack, haven't actually replaced yet.

*Problem #2: Air Comes out now but hot.
-I tested the pressure with the A/C on (noticing the clutch was not engaged at all) and it only read about 10.
-I added a small amount of charge and the clutch started to engage in short bursts, which did not result in cool air.
-I unclipped the sensor and jumped it, resulting in continuous running of the clutch and ice cold air blowing into the cab, but very low PSI reading.
-But I noticed the pipe into firewall was pretty quickly icing up which seems bad, the ice stops mid pipe, so maybe clog?
-NOW: 1-System running as is, no or intermittent clutch engagement = Very high (red) pressure reading, hot air. 2- Running with jumped sensor = Very low pressure reading ≤10 blowing cold
-Notes:
-I have not noticed signs of a leak.
-I swapped the horn relay for the A/C (same kind) with no change.
-There is slot for a flat bladed 30amp fuse entitled air in the fuse box under the hood which had neither a fuse or a clip in the slot to install one. Also no extra loose wires. (?)

Questions:
-Is the sensor malfunctioning or is it pointing to another problem?
-Is this line clogged, if so how do you fix that?
-What else should I be checking?


Additional info:
-This truck has a lot of small-lrg electrical problems.
-The windshield wipers also only work on high.
-2 professional mechanics plus myself repeatedly over the last few years cannot solve the mystery of codes: P0700, P0727, and P0742 referring to TCM problems involving engine speed control sensor and Torque Converter Clutch Circuit Stuck On. The truck will go into limp mode on occasion seemingly only after it rains.
-I'm forgetting all of them in this moment but presume other things like dashboard mileage clock intermittently cutting out, door switches etc.


Thank you