Took my trailer in for the annual maintenance stuff.....when I plugged in the lights, brake controller (Tekonsha Prodigy) read N.C. (no connection). Went ahead and pulled it to the dealer (less than 5 miles). Told them of the issues-we have replaced the plug to the truck, regrounded the brake wire under the trailer, and brakes WORK.....but, still, N.C on controller, and when I apply the brakes I should get a number (the gain it is set at) but it is blank. As I said-brakes work.....so, thoughts? Maybe just need a new controller? Maybe the LED is shot? It is 6 yrs old, so I guess it is possible....even tho it is hardly ever used.