Ten days ago, Jets guard Pete Kendall went public with his unhappiness over his contract situation, demanding to be released or traded. His feelings haven't subsided. If anything, he's madder than ever. Beyond the money issues, Kendall is steamed by what he perceives as a "good cop, bad cop" smear campaign being waged by the Jets, and he vented those opinions yesterday in a phone interview with the Daily News. He also addressed speculation that, as the Jets' union rep, he blew the whistle on coach Eric Mangini for running minicamp practices last weekend that may have violated league rules on offseason contact. The NFL Players' Association reportedly is looking into whether the Jets broke any rules.