2003 Accord Windshield Washer problem

My son has a 2003 Accord that he lent me for a week, while he isn't using
it. I noticed (here in winter New England) that the drivers side windshield
washer just dribbles a little bit of fluid, while the passenger side is a
normal full blast squirt.

So I figure it's got to be a serial circuit of some sort from passenger side
to driver side of the fluid hose. I popped the hood and the hoses are not
exposed, they are under this metal cowl that has no apparent method of
lifting off. There are two little metal tabs on the cowl, near the drivers
side nozzle that look like they might be the key to getting access to that
side, but no matter how I push them I don't seem to be able to dislodge that
cowl.

What I do know as that a year ago he had that side windshield wiper
motor/blade mechanism worked on as something sheered when he didn't scrape
the windshield on a iced up windshield morning. So perhaps a mechanic
dislodged something on the washer when working on the wiper. ...maybe.. it's
a theory.

Any help as to how I get in there to look around and figure out what's
wrong? Or is this a dealer only gig?

Thanks in advance for any help.

Steve