It may be related to the work. I would fill the washer to max and add some disinfectant...not bleach, but pinesol or lysol. Let it soak for 15 minutes and then let it pump out.
Most washing machines should NEVER be tipped on their side. In my experience, ,most can be tipped onto their back, but never on their front or sides. You can damage some of the tub fittings that way. I would be on the lookout for a leak for a while.