n MOC SL 737-SL-32-138 REV. 8 SUGGESTED SHOP MAINTENANCE PROCEDURES FOR WHEEL AND TIRE ASSEMBLIES. SERVICE LETTER 29-APR-20I3 SL 737-SL-32-140 BRAKE METERING VALVE STATIC SEAL LEAKAGE. SERVICE LETTER MOS 05-OCT-2006 SL 737-SL-32-141 PROXIMITY SWITCH ELECTRONIC UNIT (PSEU) P/N 285A1600-5. SERVICE LETTER MOS 17-NOV-200