cruise control stopped working on 2003 ford taurus

What is your question?

The cruise control always worked fine on my 2003 Ford Taurus wagon with DOHC (24 valve) engine. Today I brought my car into a repair shop to have the rear brakes repaired (rotors, calipers, pads, and master cylinder). When I was driving home from the shop this afternoon, I noticed that my cruise control no longer works. The green indicator light (that says "Cruise Control") on the dashboard panel no longer illuminates when I try to set the cruise. I called the mechanic, and he suggested checking the fuse. I checked the #32 position 10Amp fuse under the dash. It was ok. Next I checked the brake pedal switch. It seems to be ok, and the brake lights illuminate when I step on the brakes. Next I checked the cruise control physical linkage, and it doesn't seem to be binding. The next step is to check the Output Shaft Speed sensor, right? But I can't seem to find it. Can you tell me how to find it easily? And how to test it? Also, if the fuse is good (seems to be), why doesn't the indicator light on the dashboard illuminate (even if the cruise control refuses to physically engage)? I am concerned that maybe this mechanic is playing me for a sucker. Does that seem likely to you? How long have you had this problem? since I had a brake job today