During lightning storm power went out and now they dont work

Relay contacts could be shorted, but if there are no relays on the board and the switch on the cradle is not shorted, then there is a transistor somewhere responsible for taking line off-hook. Usually it is in series after the diode bridge used to power the phone ckt's.
This phone likely has a hold switch on it as well, the hold ckt's can fail as well, causing phone to remain off-hook. Again usually a shorted transistor.
Only way to know is to start replacing.
Your likely going to need a schematic to find out which one, unless your willing to remove them one at a time, and test them out.
It's usually an PNP type also, but not always...
Some are common signal transistors, so don't be afraid to sub with common types, but in most cases correct repair only with same types.
Also be sure to check the diodes, and look for any burnt components.

Good luck