Dispatched our LA County technician to complete approved A/C repairs for one of our commercial customers. The Trane units needed their condenser coils disassembled to receive a thorough, deep clean. While performing the deep clean, our technician found the unit #6 was low on refrigerant due to leaking schraeder valves. Received approval to make repairs to #6 while onsite. Obtained valves and replaced. Confirmed all units were operating normally again. Job complete.