ECTRONIC UNIT (PSEU) P/N 285A1600-6 (SUPERSEDED BY SL 737-SL-32-180 REV. 8). SERVICE RECOMMENDED LETTER MOS I8-SEP-2012 SL 737-SL-32-180 REV. 8 PROXIMITY SWITCH ELECTRONIC UNIT (PSEU) P/N 285A1600-6. SERVICE LETTER RECOMMENDED MOS 02-APR-20I3 SL 737-SL-32-181 -737NG NOSE LANDING GEAR NON-CONFORMING STEERING SUPERSEDED