The pump assembly is the likely failure, but the sump may also be partially stopped up preventing water flow. The pump (AP3776224)is located under the washer and isn't to difficult to replace, but it takes time if the washer if full of water. I don't know what other parts the tech would be referring to, unless you are having additional problems. They have been known to make noise during use which would indicate a need for a u-joint kit. If you are going to do the work yourself, start bailing water out, just to same some time. The pump is under the bottom panel held in place with three screws. Have towels handy as all the water from the sump will be in your lap quickly. The new pump and motor slide into place where the old one comes out. Three screws, move one connector and two hoses and your done.