Make sure the wires to the motors are connected on the ESC as well as the motors themselves. Unlikely you would lose power connections to both motors at the same time, but something you have to check. The fact that you have turret function, means the receiver is communicating with the ESC. You might need a new RX 14 board. THis can be had for about $25

Any glue for styrene would work or of course CA for the wheel issue.

Sounds like you can remove a link from your tracks, Anyone will do. Remove a couple of pins drop out a track section, and pin the track back together.

Nice bridge and battlefield