Might the reflector be bent a little? A slightly warped dish can affect the signal. Also, check the rivets that attach the lnb arm to the skew plate. If the arm is skewed out of alignment, that might cause it. Not sure how the Birddog works, but make sure there are no settings to change in order for the different lnb's to be recognized. Put a line directly from the first port on the left of the lnb. That isolates 119. The 2nd port isolates 110. The third from the left isolates 129. If you lock into say 129, and the Birddog ID's it, then the line from the 2nd port should ID 110. If the line from port 1 doesn't ID 119, then either the dish is suspect, the settings need to be changed, or the lnb is shot. I have seen some dishes where the settings (elevation) are as much as 3-4 degrees different from what the manual says.