Looks like it might have been the inlet valve.
I had a spare on-hand and just swapped it out. So far no leaks around the base and no dripping when pushing the foot pedal flush. So far...
The last time I replaced the inlet valve was June 2019, almost 3 years ago.
Good to keep spares of these valves on-hand.
BTW, IMO only use the genuine
Dometic 385311641 valve. I had bad luck with the knock-off compatible brands, those leaked terribly.
Also, I had put in a
ball-valve shut-off a between the supply line and the inlet valve, and it was one of my best mods I made along with the
bidet I installed. :-)