Should I cancel our appointment with the repair tech for our washing machine?
The first (and easiest) two things to check are:


Drainage hose  - Inspect for kinks or other obstructions.  Measure the max height of the pipe and verify via the manual that it is within acceptable limits.
Machine Level - With a long level, check the machine front-to-back and side-to-side for level.  Adjust the feet to correct as necessary.  Even if level, ensure all of the feet are making solid contact with the floor.