Hey guys had one I wanted to bounce off the collective. Two, 410a 5 ton Lennox split systems. They are just over a year old and have been running great. I get a call from the building owner about a loud vibrating noise coming from the roof. One unit sounds like it always has, but the other is super loud. It sounds like a compressor, just 3 or 4 times as loud. It has never sounded like this before. Any ideas? The units cycle normal and the computer room is at temp. Suction pressure is about 100 and discharge ranges from 210 to 410 with the Lennox fan cycle control.