My partner and I submitted applications to renew his student status and my open work permit in June (they expired at the end of August 2015) while our PR application was being considered. He got his new student visa in August, but my work permit was (is) still in process as there is a backlog. We landed as PRs on September 18, with me on implied status. While going through the landing process, I asked what I should do about the work permit, and they told me to call CIC. On the third call I got through, and they emailed me a form to withdraw my application for the work permit. I filled it in and sent it back - it was basically a CSE. On the phone they told me that it was possible that no one would address my request until my work permit came up for review - probably in the middle of October. They also said that if my withdrawal request was approved, I would get my $255 back, which was good news.
The CBSA agent took away my partner's brand new student visa at the border when we landed. Oh well.....