TXLeXTC

So last night my -gnd batt connection came loose. I couldnt start the car, wiggle wiggle jiggle and it started right up. (This has happened once or twice when the terminal gets loose.) So this time NO dash lights. NO Gauges, NOTHING. The radio lights come on if the head lights are off, but anything controlled by the dash dimmer **** doesnt come on. Tried all fuses (Floorboard and under hood) no luck. Lexus says that it has to be a hard wired problem and they have to pull the dash to check it out. Any thoughts on this?? I really hate to send in the car for elec work, that always pans out bad. But while im headed there here in Houston which dealership do you guys recommend for service Westside or Clear Lake?