Who pays for this testing?
According to AIA B201 the architect my order testing or inspections of work if they believe it to be in the best interest of the owner. If I had concerns of this nature I would first inform the owner, then consult with the structural engineer (if the problem were structural) before ordering testing as appropriate. This testing would be paid by the owner, however if the test showed a failure the cost of the test and the replacement of the work would be born by the contractor.