Prob compressor valves I reckon
Take lid lid off compressor passenger side under sill. Undo pipes from bags and allow to deflate. Make sure nothing under car that could be crushed! Pipes won't go crazy and blow you away. Valve block easy to see and has lids held down by plastic clips. You can then take them off and clean out any dust. On mine the clips came off!=bumpy ride home till I figured it out!
Think the filter from memory is behind rear left pillar tail light, but that may be for the rear diff. Anyway if dust at valves, would need checking.
On mine if one bag had a hole the other stayed up; I guess it unlikely both bags blow at once.
I bags are staying up, they are probably ok.
Compressor will 'time out' sometimes when re-inflating, turn off and leave it a bit then on again.