Technician is performing a 33 point inspection and maintenance on a package Trane unit. Initial readings on refrigerant. It seems low.. The unit is vibrating, pretty harsh all together. Lots of vibration noises. The blower wheel area has a lot of mold on it, and the blower wheel has mold on it as well. The units electrical side is reading within spec at this time. A part of the shell was blocking my access to check the ductwork. Customer does have an air scrubber installed, and a hard start.