I tried holding MUTE and SELECT on the remote and then entering 11756 but it had no effect. When I held the buttons down on the remote nothing happened for a couple of seconds, then the green "TV" light on the remote came on, then it went on and off a couple of times, and went dark. There was no response on any device to my entering a code.
UPDATE! On another thread I read to hold MUTE and SELECT and enter 987 to clear codes, then repeat and enter new code 11756. This did the trick. Remote working now!