Good luck with that, every Medical related thread I have read on here is full of Pilot's saying 'why would you tell your DAME that?' Keep your GP and DAME seperate. I have always been totally upfront with CASA and it has always been a total pain in the arse the extra hoops you then need to jump through, if they want a true open culture it needs to be far more predictable and certain as to what the outcome will be.