The garage door opener of my 2012 Fusion Sport, which has functioned well since I purchased the car new, has stopped opening my garage doors. Button 1 has been used continuously, 2 was programmed but only used 10 times at most, and 3 has never been programmed or used. I cleared and tried to reprogram the transmitter without success. The red lights above each button did light so I assume it is not a power supply problem. I could not find any info in my Chilton repair manual re these transmitter's. Any suggestions? Alternatively, are these self contained units so that if I obtained a used visor unit from a wrecking yard, I could just swap out the two and program the new one to my doors or is there more computer work required because it's a different car? Thank you for any suggestions from anybody who has experienced this scenario before.