Dave,
This has come up many, many, many, many times over the last several years. It's a common problem with 726's and apparently 736's as well. Using 'Search' or 'Advanced Search' on the forum should bring up a large number of hits.
For what it's worth I have a 726 with the same challenge, except the forward direction is the sticky one. Someday I'll find the time to fix it. Until I do so I enjoy seeing this come up again and again to prep me for the task. The help on this forum, whether the earlier posts, or Adriatic's here today, will be critical when I finally get around to it.
Let us know what you find.
Mike