I am unable to retract the specimen FAQ Report The retraction mechanism on the specimen advance system is defective: Open a service call as the spindle may be faulty. The PCB control board might be faulty: Open service call to have the control board replaced. Please have the serial number available when calling Leica. The coarse feed motor is faulty: Open service call to have the coarse feed motor replaced. Please have the serial number available when calling Leica.