+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
They send the application back to start processing again. They used to send it back to the original visa office, but now there is a pilot project where won appeals are sent to be processed in Ottawa. The PR could be refused again, but it would have to be for a different reason. This doesn't happen often, but is possible.
 
oh ic thanks for the info... i really hope it doesn't have to end up again ... its been 3years now... and finally won that ADR... just praying now it doesn't get a fail again...