Aerangis ellisii - brown spots on leaves

[mich]

Hi all,
I've just received an Aerangis ellisii in the post from a commercial grower (new species for me) and it has arrived with a variety of dark spots on three out of five leaves - some nearly black, some indented into the leave and some just dark brown discolouration but not indented into the leaf (yet!).

I've had a look at the sticky post re diseases and wondered if it was bacterial brown spot or not? Does anyone have any opinions on this and do you think I can stop the spread?

I've hopefully attached some pictures!

Many thanks

Michelle