Hi tsc,
Sorry to hear about your board. You do not have to replace the tank because you can buy replacement parts (boards, transmitters, tracks etc) from a Canadian company at
www.matotoys.com . Check out their site and order what you need (always a good idea to bulk buy some boards) and it works out cheaper than replacing the tank.
I must add that I have been extremely lucky so far and have never had a board failure. This is pretty amazing considering I have 10 Henk Long tanks and I run them pretty hard outdoors.
Best of luck.
Cheers

Mario