1516, 1030,and 1057 errors. 700fpm car, car runs fine with full runs from top to bottom, no errors at all, the 3 errors will occur anytime the car is sent to the 4th floor in the down direction, when the car slows down the error occurs. upon further investigation, the car will get the same faults while on cartop inspection, and nearing the 4th floor. in the last scenario, it will happen 90 percent of the time. any ideas. TBS has been done.