Only one pair was identified in the main list and another was supplied by Ben Holmberg, although there might be more if one extends the search into rarer loan words, such as jupe/dupe. Obviously the contrast is not a problem for learners though the sounds are very similar.
lesion legion leisure ledger
Barbara Bevington has pointed out to me that there is an additional pair for speakers of American English:
version virgin
John Higgins, Shaftesbury, December 2010.