Hi group.  I hope everyone is having a great Monday.  I have a question I was hoping you guys can help me to understand.
(Note: I didn't perform the repair, nor did I see the project site but I would like to have a better understanding so I can address my customer or have the info for future reference.)
In the end of April of this year we completed a seam repair project for a customer (my records show that an acrylic filler was used).  The customer's original inquiry stated "The epoxy in the seam has cracked."  I have never known a customer to mention a crack repair issue like this (they usually just say there is a crack or the crack has opened) and this makes me believe that perhaps he attempted to have it repaired in the past either by his own hand or through another professional.
He called me today to tell me that the crack has opened again.  (We have never had a crack re-open on us before) Being that I never saw the surface, I was talking blind to him and making an appointment for us to come take a look for him.  However, he did mention in this conversation that it is the seam near the dishwasher.  I little light went on in my head thinking that maybe the vibrations of the dishwasher could be causing this issue.  But how much vibration can come from a dishwasher to crack the counter?  Then again, it is the seam which is the weak point of the counter.
I am going to go take a look myself next Tuesday.  I will have Alex with me, too.  But I thought I could get your thoughts about what I should look for and any options that could resolve the issue.  Should I try to start the dishwasher to see how badly it vibrates?  Should I look under the counter to make sure it is properly supported underneath?  Are there any suggestions as far as a products go?  Am I correct in thinking that an epoxy filler should be used instead of acrylic?
Thanks!  Please know that I am not the one usually on project sites but I am trying to learn as if I am a restoration pro so that I can be the ultimate sales guru for my business and sound educated when I talk to my customers.  Also, maybe I could help take on some projects on my own eventually (besides tile and grout).  Thanks to all of you, I am learning a lot.
Your thoughts?