Onya Johnno,
The damage may well be only limited to the components that control the Drive and Braking functionality of the chip. A simple test is to hold the back wheels off the track and slowly push the car past a lane changer (LC) which is set to the change position; if the flipper clicks back to straight ahead, it is worth getting the chip fixed as it is not completely Bjorked.
The cost of a repair is roughly 9$ Oz, factor in the postage costs and you should be able to work out how many chips it would take to make it cost effective to get them fixed. So don't bin any damaged ones because you will get a few ......
As my Crystal Ball is at the cleaners ....... some good clear photos of the chip and how it is wired in, would help aid the diagnosis.