2018 lt625 a/c troubleshooting checklist

[Kw9006nz]

Afternoon guys,
In Utah and it's hot.....a/c was freezing all morning, stop for a quick bite to eat (beaver taco, in beaver Utah get the shrimp burrito) came out and the check ac warning on the display flashed then disappeared. No codes no thing just warm air.

First thing I grabbed my gauges to see if I need a splash, the low and high side are reading 120 psi.
(Left my ohm meter at the house will be there tomorrow) what should be the next step?
Do I just replace the pressure sensors straight away as they're 8 yrs old
Then replace the thermistor? also assuming it's also 8 yrs old
Finally how to reset the bcm? I tried removing the fuse for 5 minutes while also shutting the truck lol thanks google ai

What else to check?
Last ih a/c I worked on was a good ol 97 9400 many more things I'm not familiar with
Thanks in advance