Cylinder 2 Injector Won't Fire - Triumph Street Trile 675

Hello fellow Triumph riders,

In April I crashed with my bike (Street Triple 675 2015); nothing major, but my bike was in the shop for 4 months waiting for insurance to pay up and for all parts to arrive. My bike was finally fixed last week, but after I started it, I noticed that it sounded more like a twin rather than a triple. I checked my OBDII sensor via the TuneECU app and I saw error code P0202 - open circuit along with high cylinder pressure for all cylinders (~720 hPa).

Does anyone know how to diagnose the issue? It could be because of a gummed up injector since the bike was sitting in storage for months, but it could also be due to a fault in the electrical system.

I perform routine maintenance on my bike (chain tightening, oil/brake fluid/coolant change, etc), but I don't know where to start with this one.

Cheers and thank you in advance