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Case today using a GE Avance S5 Carestation Anesthesia Machine. First case of the day, L3-S1 TLIF, elderly female with severe kyphosis in the prone position. The max airway pressure alarm set for 40 cm. When switched to Vc ventilation, TV 450ml, RR 10, no PEEP added. Peak airway pressures 25cm but the high pressure alarm is activated continuously. There was also a message box noting high PEEP of 12cm with a question of tube obstruction. Switching to manual ventilation, the high pressure alarm disappeared as did the measured PEEP. What is going on?