Fabulous work! Alliance was responsive, fast, and easily fixed a problem that has been plaguing us for far too long (and one the original installer of our garage door would not repair). They realized that one of the eyes on the safety laser had a low bulb, and that was why our door would not close when it was sunny outside. While they were fixing that, they greased all the connections and checked a faulty light bulb in the main opener. Great work! Would definitely hire again.