With my new house came a remote for the garage door for which I bought a second remote for. I bought the identical model #139.53859 as the first remote. The directions for coding show a diagram refering to a green "SRT" button and a green indicator light that should be on the back of the garage door opener unit, which I found out I don't have. The unit itself is probably an older model being that it just has a PC board, rotor and wheel. I've already called Sears & Home Depot (where I bought a universal remote that also could not be coded without a 'learn' button) and no one seems to be able to help. how can I code this new remote?