Diagnostic work for (3) Carrier RTU’s. Diagnostic work listed below in the order units were accessed. All model and serial numbers will be listed in estimates. Chud will provide estimates to perform each of the (3) estimates. #1. Diagnostic work found Carrier RTU completely void of refrigerant. Customer advised that the unit was working about 2 weeks ago. Oil was visible near compressors. Chud will email quote to find leak. This repair may involve multiple visits as dye and/or nitrogen pressure test will be needed to determine if it’s repairable or not worth repairing. Carrier RTU S#3215P83541 #2. Previous contractor has “Y2” removed from the board. The unit is currently operating at 1/2 capacity. We engaged the contactor to get an amperage reading and the compressor scrolls were noticeably grinding and only drawing about 3.2 amps. Compressor will need to be replaced. Carrier RTU S#3215P83539 #3. Breaker tripping after about 15-20 minutes of run time. I suggested removing “Y2” and