This frustrated me a lot- I don't think I'm a slow learner and am fairly certain I'm not alone here.
To retune and get all the channels back, plus Duke etc, update your satellite transponder lists (in the TV Server Configuration manager) for EACH receiver, then add Optus D1 (160 E) and D2 (152 E). Use advanced tuning parameters and override the default LNB frequencies with the following:
Low (LOF1): 10750
High (LOF2): 0
Switch (LNBSW): 22500
Damn frustrating. Should work generically applied to other devices with full tuning control.