Hi Tonero,
I am in the same boat.  I applied for my PGWP in May and got it approved in August 2015.  However it was issued up to my passport expiry in June 2016.  
I would like to send in my application for extension now (because of the long waiting time).
How do I go about getting it done online?
To get to the checklist, there is a question asking "What is your current immigration status?"  Do I still put in student?  
Tried calling the help line on Monday but did not get through. 
Thanks.