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Has the dealership scanned the ABS control module fault code and if so, have they told you what the fault codes and/or definition are?
Ok, for me to know if the source of the problem is something you can repair yourself, I do need to know what it is. While it could be the brake light switch which is in fact easy to replace yourself, it could also be the abs control module itself, one of the wheel speed sensors, the yaw rate sensor, the steering angle sensor, or a wiring harness issue. Some of those are easily replaced with basic tools, some do require a dealer level scan tool to do programming after the part is replaced.