PLACEMENT.. SERVICE LETTER INFORMATIONAL MOS 04-APR-2001 - Is) St 737-SL-23-032 REV. A AUDIO - REMOTE ELECTRONICS UNIT (REU) PIN 10-62090-121 (AVTECH PM 5340-1-1). SERVICE LETTER INFORMATIONAL MOS I9-OCT-2001 -(s) St 737-SL-23-032 REV. 8 AUDIO-REMOTE ELECTRONICS UNIT PM 10-62090-121 (AVTECH P