Sounds like the Bemmer my husband brought from a little old lady who only drove it to church.
Low miles, excellent report from her certified mechanic and the transmission went as her backed it down the driveway after picking it up! Bad luck, time for it happen.
And the mildew thing - they probably cleaned the refrigerator and then shut the door. You need to leave that door slightly ajar. I know this one from experience.
Good luck. I hope everything works out for you.