Question about bagged sliverado

My viair 380 has been out for a while It no longer pumps air.So i use my home compressor till i can get one.When you air the truck up it will go down in a few hours( The front first cause it is heavier)Being that the 380 is not working could it be leaking air at compressor??I've checked bags and lines and do not see any other leaks.

It very well could be. Disconnect the compressor from the tank and plug that hole. Air the tank up and go around with soapy water and spray it on all the fitting connections. Any bubbles you see is sign that your loosing air from that spot.