[Tiara Sovran] Holding tank smell

[holiday3900]

Gauge has no lights (manual says that means it is between empty and half full) and barely used the head this season so have to believe it is right, but getting urine smell from bilge (gross but accurate) . Still finding my way around the new-to-us vessel. Anyone have suggestions before mechanic show up tomorrow and gets into head work? Thanks.


Sent from my iPhone using Tapatalk