Having installed several dishes over the years, I gave this a try already. The first problem was that 129 was not listed as an available sat on my point-dish screen, so no AZ or EL info was shown for my zip code. I found a zip code chart online which listed the AZ as 232 and EL as 28.8 for my zip (62704). The current position for 61.5 is AZ-139 and EL-36.
I marked the current position with a sharpie, lowered the EL 7 degrees, then swung the dish around while my wife watched the point-dish screen set to 129. After more than 30 minutes of going back and forth, I was unable to get a signal, so I moved the dish back to 61.5, which I found easily.
The dish is mounted to the fascia under the eve of the roof, and I noticed that the elevation when pointed at 61.5 was 32 degrees on the actual dish gauge instead of the 36 that it was supposed be. This leads me to believe that the original installer did not get the post plumb. If this is the case, swinging the dish around the azimuth would also change the elevation, making it difficult to find the sat.
I just thought that if Dish did the re-pointing for free, I'd let them mess with it rather than getting back up on the roof.