Troubleshooting PVP4800 after lightning strike

Greetings.

A few days ago, during a rather intense electrical storm, my system got hit by lightning and went down: no humming from the GTI and nothing on the display. Preliminary forensics show that the DC voltage from the panels is normal, the AC side is normal, the external fuse on the unit is still good. Looking around inside, the DC is getting where it is supposed to go and there are no obvious failed components (nothing melted, charred, exploded...). I cannot see any fuses on the various circuit boards. I had the head electrician from the crew that installed the system with me during these checks. He feels (though he admits that this is the first solar installation that he has seen damaged by lightning - there just aren't too many around in our neck of the woods) that the fault is in the board located in the top compartment of the PVP4800, which, I surmise, is the heart of the inversion process and contains circuitry for the display. Anyway, he and the electrical contractor's main guru on solar/wind are trying to reach the manufacturer for parts and instructions.

My question: are there any measurements that could be made by someone with experience in electrical/electronic troubleshooting that could help narrow the scope? I'm thinking back to the days when people actually serviced things like TVs and audio equipment, and the schematics would list voltages that you would expect to see at given connections if things were working normally. Maybe I'm being anal about this, but I kinda like to know what's wrong before I try to fix it.

Side note: Actually, the repair will be covered by my homeowner's, minus, of course, the deductible which will probably be most of the cost of the repair. I was interested, however, in a comment made by the agent at the home office. In the spirit, presumably, of attempting to prevent fraud, they actually checked lightning activity on and around the date we got hit. She told me that, in a 72 hour window around the time when we were hit, there were 348 recorded strikes in our immediate area. Apparently, that number is large enough to convince them that I am likely telling the truth.