Suspension dump light won't go out

[mbulriss]

OK, the title sums it up: the suspension dump light on the dash does
not go out. Always seemed a little slow going off after the tag axle
aired up, but now it just stays on.

All suspension air bags *are* fully aired up. Checked the Clippard
valves in the front load center on advice from Ralph - no leaks found.
Crawled around under the rear listening for air leaks and checking
the air bags. No leaks heard, but of course that for sure doesn't
mean there aren't any, based on older ears!

Any ideas on what to check next?

Thanks,
Mike Bulriss
1991 WB40 "Texas Minivan"
San Antonio, TX