My phal's leaves has some damage, Please help me save my phal.

[Cham]

Hello everyone. . . Please help me save my phal. I really love it.
I am a complete newbie to phal orchid growing; I grow few oncidums and dendrobiums successfully thought. I acquired a phal 2 weeks ago. It came in a plastic pot with drainage holes at bottom and with full coconut husk pieces medium. I kept it in my indoor garden which receives 4 hours of indirect light and rain water. (My other orchids are in same place and they are fine.) I didn’t water it since I got it because it was well watered at the store and it didn’t dry out. After I read this forum posts I repotted it with perlite and wood charcoal mix potting medium three days ago. I made additional holes at sides of the pot also. When I removed it from original medium (which were wet) there were four rotted roots and I cut them off with a sterilized blade. All roots which were inside of the pot were very pale beige and firm. There were little damages on two lower leaves. It is like some pest has ate parts of the leave. all leaves are firm and seems healthy. I searched for any type of pests in roots and leaves i didn't find any. Since I noticed little more damage on leaves over four days in indoor garden I moved it to an east facing window with my African violets. I have attached pictures of the leaves. Please help me cure it. As additional info - I live in a tropical island called Sri Lanka in south Asia. Therefore temperatures are at 25c to 35c year-round and get enough rain year-round so there is high humidity. I don’t have any equipment to measure humidity at my home. Indoor garden has a water feature so humidity is high.
Phals are very difficult to find in my country dands and oncidiums are the commonly growing types. I have attached a picture of flowers of the phal in case any of you want to identify it. I don't know about it's specific name only know it is a phal.