California

I am a new owner of a 1992 subaru legacy wagon (140k) with factory pneumatic suspension, recently the "hi height" switch, has been rapidly flashing after roughly 10 minutes of driving. The suspension appears to be operating correctly, isn't bottoming out, isn't sagging, the compressor sounds like it is operating correctly. My question is why is the "hi height" switch flashing and what are some possible solutions before it goes to the dealership. Thanks