From Ken Davidoff:

Andy Pettitte is extremely unhappy with how his negotiations have gone with the Yankees, and the lefthander might be softening on his opposition to rejoining the Astros.

What once seemed a fait accompli - Pettitte returning to the Yankees for a 12th season in pinstripes - now appears increasingly in jeopardy, although the two sides continue to communicate and they ultimately rank as each other's first choice.

Via Andrew.