D156, lift was in limp mode. After Linde tech had tried to troubleshoot and connect with their software, it was determined that the wiring harness had an issue. Ordered wiring harness and installed in lift, lift had the same code. Linde tech came out a second time and still could not connect. He recommended replacing truck control module, Replaced it, still same code, then we replaced the display module. Lift operated for about 10 minutes and coded out again, with the same indications.
Any assistance would be great.