Hello my name is XXXXX XXXXX X can help you with your problem.
are the lines in the view finder?
in the big display?
are the also visible if you download the picture to a computer and open it ?
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I don't see lines in the viewfinder when taking a picture. Only when I view them afterwards and also when I download them on the computer.
sorry to tell you but you sensor is defect, it is not impossible but very unlikely that this has to do with the changing of the lens in high humidity.
This can be repaired if you feel like doing it yourself let me know and I can guide you thought the process.
Otherwise I recommend to send the camera to canon for repair.
Some of these have a 3 year warranty depends on when and where you bought it.
here is a list of Canon repair centers
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