If the bag was leaking it most likely wouldn't air up at all. Odds are fittings are leaking there. Yes you'll have to pull the front bag to get to fittings. Which means disassembly of front suspension, easiest way to get it out. Should have all thread coming up thru the front shock hole, can unbolt the upper ball joint and break free spindle unbolt the all thread and feed the cup and bag out of spring pocket. May need to unbolt lower bag plate as well. Been a few since I've pulled mine out for service. Going to in the spring g to run new lines.