Air Relief Sound NOT There

[D]

Hi All,

I hope everyone is having a Birding good time. I've got a problem I'm
hoping is minor. I appear to have an over pressure situation. I don't
hear the air relief sound from the dryer as I always have. I have 125
psi in both front and rear tanks, so the guages say. I hope this is a
cleaning issue. Along with that, my low pressure buzzer and light came
on the other eve, as well. Guages show plenty of pressure and the
brakes release fine. I have already replaced the warning sender once.
I'm thinking it has trash in it.

Any suggestions would be just fantastic.

Thanks!

Dru and Debora
1983 FC RB