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Same thing happened to mine and also tailgate was opening at random.Re 2010 wagon
This seems to be best spot to post my message as relevant . Obviously age of these cars things will happen, have had to replace front wiper motor as nylon teeth were gone now
My rear wiper /washer not working but yesterday with ignition on and wiper switch pushed forward when I opened rear the wiper did a single cycle. Might have to pull rear panel off again and try the above.
As for age also just replaced roof lining.