First Problem with my Bus..

[Highway Yacht]

She ROLLED overnight... The bus had been parked for several hours yesterday evening when I checked it last night before bed. The bus was still sitting in the same exact spot that I had parked it and air pressure had leaked down to about 60 psi. This morning I went out and checked it and air pressure was down to 0 psi and the bus had rolled forward several feet. I'm going to get some help and check out the brakes and service the dd-3's as Clifford suggested.