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Hello all - I have a Durkopp Adler 767-FAS-573 equipped with a Mitsubishi Limiservo X B series control and motor. It has a Mitsubishi XC-CL-2 foot lever unit. Here’s what’s happening: i went to change the auto backtack from two stitches to three. The machine was working fine. I made the backtack change and the presser foot no longer lifts at the end of the stitch or with partial backtreadle (programmed to go needle down, presser up). Troubleshooting: At full back treadle it does the end backtack and the thread trim cycle and the presser foot lifts momentarily when the thread trims. Therefore I know the pneumatic valve for the presser foot lift is getting signal and actuating. I reassigned the partial back treadle to the backtack cycle and forward treadle to foot lift. Partial back treadle worked properly on the backtack cycle, full forward did nothing. So I know the foot switch isn’t faulty. I reassigned the functions to as before and they work with the exception of foot lift. I looked at the locked out functions. Foot lift is turned on. Should work. Doesn’t. I did a factory reset of the control. Foot lift still isn’t functioning. Everything else works. I sent the control to a company who specializes in Mitsubishi controls out of NC with this info. I think they just did a factory reset and shipped it back, but they confirmed that the control is functional, no burnouts on the board. Still no foot lift. clearly the backtack pattern is the issue... changed it back, still no presser foot lift. help...