LC5500R; S/N 413736. Display has failed. Battery is 9.4V. I have removed covers and examined system. All appears to be intact. I have attempted to measure voltage from B to ground and obtain only about 0.5V. Is B the proper terminal for this measurement? P and L2 are also cast into motor housing. No other numbers or letters are evident. Please advise. My email is judgemcw@att.net. Thanks in advance.