So I spoke to Don at Bintel, who thinks its Oxidation/corrosion rather than mold. Someone suggested that on cloudy as well. In any case I have gathered all the required parts, looked at many videos and online blogs. And Don has sent me some instructions as well. He also suggested I flock the interior. Hopefully I will have the OTA up and running again, otherwise it will have to be the Frac until a replacement comes along in the classifieds! Pity I missed the 11edge HD!