The law says
IRPR r. 308(1)A fee of $50 is payable for processing an application made under paragraph 53(1)(b) for a permanent resident card.
Renewal or replacement fee
(2)A fee of $50 is payable for processing an application for the renewal of a permanent resident card or for the replacement of a lost, stolen or destroyed permanent resident card.
Replacement due to error
(3)No fee is payable for the replacement of a permanent resident card containing an error that is not attributable to the permanent resident.
Provisions this one cites
Justice Laws is the authoritative version. If this copy and it ever differ, Justice Laws wins.