We have a Frigidaire self clean oven (model PLES389E) that was running in 'self clean' mode when we lost power. When power was restored the oven was in 'locked' mode, which we are unable to get out of. We've tried pressing 'START/CANCEL' button on the range panel, unplugging the power from the socket and plugging back in 5 minutes later, flipping the breaker controling the oven, and none of these have released it from the 'locked' mode. Guidance/instruction is much appreciated