Is this a correct diagnosis? Brown leaves with white spots

[PeteB]

I have a few plants that were inherited and I've been chucked in the deep end of looking after orchids. I'd like to keep these all alive so any advise is welcome!

Two leaves on this orchid are brown with white spots. I believe this is bacterial and the correct remedy is to cut the leaves off with sterile scissors around 1cm below the infection. Then I seal the wounds with cinnamon, spray 3% hydrogen peroxide on the rest of the plant and use a fan for an hour to dry. Would you say this is correct based on the photos in this post?

I also noticed that one of the leaves has a brown tip that I'm sure has been there for a few months and I assumed this was from insect damage as seen by the holes in the leaf (should I just leave this?) Also, as a prevention I believe bacterial infections can happen easier when the plant is stressed so I don't know if a repot is in order?

Thank you in advance!

Images: Orchid rot? - Album on Imgur