There is an art to opening up IR remotes. Some you can sort of squeeze open (if you're like me and have the missing-link type of hands that can open walnuts without a nut cracker), others you can slip a small screw driver in and pry.
If it failed the IR camera test with a good battery open it up and separate the plastic membrane from the PCB and clean the PCB and back of the button membrane with rubbing alcohol and a lint free cloth. I remember back in the early 2000s having to do that around once or twice a year on some of my high use remotes to keep them going.
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