A few years back Schindler installed 2 400As at fairly large University in my area. As part of the the University's elevator spec all the elevator contractors are required to provide a full set of diagnostic tools and manuals to the university on any new installations and mods. In this case Schindler refused to provide the SDM chip even after it being in the specifically spelled out in the job spec. The University then held a large chunk of money from the General Contractor after the building was finished. Long story short, another company was contacted to replace the 400a controls and fixture before Schindler's warranty had even expired.