i'm not gonna tell you to do the same but my husband is in the same situation as you except for your location, what he did was:
called the CIC call center to ask what he should do and they said to apply for extension of his work permit
when he asked about his TRV, they said that he does not need to apply for renewal because his application for PR is in process and is in the late stages already (meds done, waiting for PPR)
but they said that if he plans to leave the country, for a vacation or something, he should definitely apply for a TRV so that he will be allowed entry into Canada again.
He has no plans of leaving Canada until our PR application is finalized so what he sent in is the application for work permit extension only.
To anyone who knows more about this, please let me know if the advise we got was inaccurate...
Thanks,
