Catasetum bulb black spot

[silanah77]

Hello everyone and Happy New Year to all the members! I'm new in this forum, I found it occasionally when I searched the web for answers about my orchids. I have been growing orchids for 5 or 6 years, mostly phalaenopsis, but I fell in love with catasetum orchids this summer. So I have FDK After Dark SVO black pearl, I was so excited that I've read a lot about the growing process and etc. Everything was fine by Christmas - I had to leave for the holidays; by then the plant had 2-3 leaves already starting to turn yellow, so I moistured the roots for the last time. Now when I came back I found my catasetum with all leaves yellow, they fell, I cut the roots, but I saw these black spots on the new bulb...they are not soft. I've read a lot in the forums and also I've got an advice to cut out the rotten parts and apply cinnamon, but since this is my first attempt with this orchid I don't want to loose it...Please, help!
Thank you in advance and sorry for my English