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I agree with Phil. Pull the corrector and let it dry out thoroughly. Do not use a hair dryer to blow warm air in the rear port. Do not use a hair dryer to blow inside the tube once you pull the corrector.
I used a sunny day to dry out a C5 some years ago, but it only had a 50cent size area of condensation on the inside of the corrector. Worked well.
I then used a silica gel pack snugged inside the rear port to keep the moisture out. I never had a repeat of the condensation, but I don't know whether it was the silica gel or good management.
An SCT is not really a sealed tube, so if water drips or runs onto it, it WILL get in. You should definitely check for leaks. If it's just a case of condensation over time, the silica gel packs will stop that. Alternatively, you may consider a dehumidifier of some sort if it's a fixed observatory.
Hope this helps.
Mark
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