Not sure where you can go to read the letter.
The cracking is, most likely, going to be visible on the engine coolant temperature sensor wiring. If you remove the tubing and expose the wires that connect to the two 12-pos'n connectors you may be able to see some cracking there.
I believe the recall replaces ALL of the underhood wiring. This includes the fuel injection harness and the computer harness.
As to what kind of inspection your dealer will do, that depends on how honest they are. Understand that most dealers/techs do NOT want to perform this recall because they get paid less for recall/warranty work. So there is an incentive for them to not look too hard to find the problem.
Brian
