Front air bags deflating

[jdlashua]

My front air bags deflate about 5 minutes after I secure the engine.
The pressure gauges for F/R air tanks remain good. The low pressure
warning light doesn't come on. I've dumped and refilled several times,
but still does the same thing when I shut down. Is there a check value
in the height adjuster or somewhere else that may be giving way or am I
looking for a slow leak in one of the lines. Anyone have any advise how
I troubleshoot this?

James Lashua
84PT40