Diagnosing "lightning damage"

I have a Series 3 652... Tivo in a vacation property and was just notified that a recent lightning strike likely fried my Tivo. I am going down in a few days and am looking for suggestions on how to diagnose/determine the damage. The unit has a cable card and is connected to a tuning adapter. I upgraded the HD to 1TB and will be taking the original 160 gb drive with me. I also replaced the power supply and will be taking the original which may not have been bad. Any suggestions on how/where I start to rule out damage to cable card/tuning adapter/hard drive/power supply? Maybe another way to put it is there some way to test/confirm if the motherboard is toast? Thanks for any suggestions.