737-SL-23-029 INTERPHONE SYSTEM - REMOTE ELECTRONICS UNIT MODIFICATION. SERVICE LETTER INFORMATIONAL 15-AUG-2000 MOS - Is) St 737-SL-23-030 BOEING RADIO COMMUNICATIONS PANEL UPGRADE TO P/N 285U0037-61X. SERVICE LETTER INFORMATIONAL MOS 27 -SEP-2000 -(s) SL 737-SL-23-030 REV. 8 COMMUNICATIONS - BOEING RADIO COM