Water Driping Inside

[Cuppa]

Hey Bob, I sure hope you're right, & I'm optimistic you are. One of those holes is in direct line for all the water that drains from the passenger side grill, directed by a rubber strip. Some of my 6 holes had a sort of rubber washer on them, most were missing.
I have spent the weekend trying to track down this leak. I put additional windscreen sealant along the bottom of the screen, under the 'flashing', & sealed all gaps between flashing & screen. I was confident I'd sorted it but hosepipe tests quickly showed otherwise. I found a firewall grommet that has previously been cut for cable entry (cable no longer there) where I could see water running in, directed by a loose piece of insulation on the firewall. Insulation fixed & hole in grommet sealed.
Hosepipe test - Bollocks! Still getting in.
So now I've tried using some of that windscreen sealant to seal around all those holes that take those weird little pastic fittings to hold the 'grill' piece on (& the ones that hold the flashing on just for luck) Will try with the hose test again tomorrow when it's light.
Fingers crossed - I've run out of options.

In the photo I've asked 'What is it?' about a couple of items. The big white plastic casing looks like a fan blower, but when I switch the fan on , on the dash, holding my hand on this case , I can't detect any difference to when the fan is off. With the electrical connector removed, I unscrewed the 2 screws holding the'socket' & removed it from the case. On it's reverse side was a small printed circuit board. What is this for, & why is it stuck in the bottom of this 'blower-like case'?

Cuppa

Photo looking up from passenger footwell.