Working on a Schindler 300A, problem I'm having is we found a bad LD sensor in COP. Original problem was elevator would run and slow down but not recognize reflector tape, replaced LD sensor and now elevator runs up and as soon as Up Slowdown sensor reaches any reflector it automatically drops back down to bottom floor, also car runs on inspection and as soon as it hits any top limit switch it sinks down until switch is disengaged and runs back up to switch and then sinks back down again. Any suggestions