Recently there are few 2014 Jun-Sep applicant received RQ issued by Sydney and the main reason for issuing was residency calculation error, too many travels to US/middle east etc. Sydney issued RQ within few days of showing eCAS In Process status.
Local office now hardly issues any RQ after test except I believe 1-2 person received due to passport stamp and residence calculation clarification or stamp is not clear/unreadable. So, make sure your passport and all travel stamp is clear and matches with CBSA record..