Try the Account Change in GoDaddy without unlocking first, just to be safe. If this doesn't work, Sedo will give you an error that the domain needs to be unlocked first - which then you do and then change. Good luck and congrats on your sale!
Thanks for the fast advice & congrats - its appreciated - great to see positive energy in this room.
Ive kept it locked for now and pushed it to Sedo Godaddy Account.
Shall keep you posted.
Best of wishes for all your ventures