Tech found rtu 1 and rtu 2 thermostats were both off. Tech went to roof and smelled burnt smell from the middle unit rtu2. Tech removed cover and found middle contactor was burnt high voltage. That is for circuit 1 tech meged compressor and found both circuits meged red. Tech found 2 time delay fuses were blown as well as one for the heat strip block. Tech found in disconnect 3 80amp fuses the middle one was blown. Tech went to breaker 125amp and reset breaker . Tech measured power to all legs to each other and to ground. They are within specs. Tech found transformers are at 230 tap low voltage was 23v. Tech tapped to 208v tap on transformers and low voltage went to 26v. RTU1 system has a popped transformer fuse. Tech reset fuse system started up tech cycled system on heat cool and all are operating properly. Tech did have to lower transformer from 230v to 208v low voltage changed as well 23v to 26v. System 1 is operating. Tech will return to continue to diagnose on rtu 2. Rtu 1 tech f