Isabel Gonzalez appealed from the denial of his 28 U.S.C. § 2255 (2000) motion. We previously granted a certificate of appealability on the following issues: whether Gonzalez received ineffective assistance when his attorney failed to (1) file a requested notice of appeal and/or (2) pursue objections to drug quantity, the leadership enhancement, or the obstruction of justice enhancements at the sentencing hearing.

The district court dismissed these claims (along with many others), finding that Gonzalez waived the right to file a § 2255 motion in his plea agreement. However, the plea agreement explicitly reserved the right to challenge “ineffective assistance or prosecutorial misconduct not known to [Gonzalez] at the time of [Gonzalez’s] guilty plea.” The claims above fall into this category, as they concern actions or inactions by counsel after Gonzalez’s guilty plea. In addition, Gonzalez has stated colorable claims that cannot be decided summarily on the current record.

Thus, with the exception of the claim regarding the leadership enhancement which has been waived on appeal, * we *448 vacate the district court’s dismissal of the claims described above and remand so that the district court can consider the merits of the claims in the first instance. We affirm the district court’s dismissal of Gonzalez’s claim that his attorney improperly failed to object to the leadership enhancement at sentencing. We dispense with oral argument, because the facts and legal contentions are adequately presented in the materials before the court and argument would not aid the decisional process.

AFFIRMED IN PART; VACATED AND REMANDED IN PART