You've done everything I'd think to do. What's odd is that the FD is the brain of the system and sends commands on to the RD, so if there was am issue with the FD I'd expect it to affect both.
You able to warranty it?
** last thought. Have you tried swapping the batteries over?
Is the FD really the brains? One of the benefits is that if the RD battery runs out of power you can simply swap the batteries over and it allows you to still shift on the RD, presumably whilst the FD is dead.
You've done everything I'd think to do. What's odd is that the FD is the brain of the system and sends commands on to the RD, so if there was am issue with the FD I'd expect it to affect both.
You able to warranty it?
** last thought. Have you tried swapping the batteries over?