Combi boiler gas valve problem

Having an error code 11 on a Noritz CB199 combi boiler. Installed Jan 5th 2021 and it's been doing a nice job of dhw and radiant duties for about 6 or so weeks. I've cleaned the ignitor and verified 8 in h20 coming into unit. I can see spark in the heat exchanger through the window so unless it's "weak" I feel as though I have ignition. I hear the gas valve assembly solenoid click on and off during ignition. I can also measure 110 vac for the 2 seconds during ignition so the coil is getting a signal. I don't know if the valve is actually work however, but I feel as though I have way to much fuel or I'm not getting any. This first happened earlier this week and I got it to run again Friday, but it quite this morning. I've been talking with Noritz tech but we haven't gotten to the bottom of this yet and it's Sunday. I'll plan to call again tomorrow but they've been slammed. I think I'm dealing with a faulty solenoid valve on the gas valve, but they have special screws on this thing I don't have bits for to diagnose further. Any thoughts are appreciated.