My brand new GE profile dishwasher run very quietly except for the end of each cycle. As water is pumped out it gets increasing loud and continues for 10-30 seconds. A service call and a new pump have not solved the problem. The service man says the sound is normal but my neighbor has the same machine and his does not make any of this pumping noise.
As long as your dishwasher is under the manufacturer warranty I would recommend to call GE until they fix it.
You can request a different tech or even a service manager to come over.
If they can not fix it - they have to replace it.
Gene.