Update.

Had Domestic Diesel evacuate the system and put an additional 2.75 lbs. of R134a. They didn't find any obvious signs of a leak. They put in a dye so it will show if there was a leak. AC is running cold. We'll have to monitor it, but it seems good to go now.

Great guys there. Only charged me for the refrigerant. Told the guys there they can take their time with it if they needed. This is not a daily vehicle for me.