Lightning strikes on transport aircraft rarely produce more than burnt rivets and missing static dischargers.
But there was a really bad one in ARN some years ago.
A DeutsheBA Fokker 100 was struck on rotation. The strike disabled both engine oil pressure transmitters. The ECAM (or whatever its called on a F100) called for L Eng Shutdown, and as soon as the crew had shut it down, R Eng Shutdown, which they didn't! It quickly returned when we replaced the transmitters and carried out the Lightning Strike Insp. This was a known problem according to TAT who were the maint organisation and had happened before.
The lightning strike insp on this aircraft was much more involved than any Boeing or Airbus that I have worked on. Usually you look for entry and exit points and if the crew have reported no problems then usually that is it. On a line station the damage has never been so great as to ground the aircraft.