Hopefully, an Alfa owner will have the answer. Not knowing anything about them, I would have to guess you have 3 holding tanks-- Black for toilet; Grey for shower; and the galley would be for the kitchen. Do you actually know the galley is full, or only showing full?
Here is what I would do--open grey water valve and run water thru the bath and lav and see if water comes out. If you get water coming out--ok. Wait til the water stops, leave the valve open and open the galley valve--run water slowly at the kitchen sink and see if anything comes out of the drain. If nothing, you have an inoperative valve for the galley and will have to fix it; if you get water out from the sink, then the gauge is wrong. If the valve is not working, and the galley is indeed full, you will get a backup in the sink...
Good luck.
Joe
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'16 40QBH Phaeton
'21 Sahara HA toad
'15 38RSSA Mobile Suites--traded
'05 36TK3 Mobile Suites--retired but not forgotten
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