I have an old Grizzly 2hp compressor (model G8889) that is not working properly. After many years of pumping up to 120 lbs, it now all of a sudden pumps up to only about 70 lbs. The motor keeps running, as if it is trying to pump up higher. The only clue I have is that I had put it in my car and took it to another location, after that trip it hasn't worked properly. I'd appreciate any help I can get. Thanks. -Howard