took my car to Audi last December coz the clutch was slipping. Audi dismounted the gearbox & decided not to replace the clutch under warrantee coz it appeared not to be a manufacturing fault then put the gearbox back together. 2 days ago i tried to use the aircon only to find out its not working. did Audi need discharge the refridgerant to dismount the gearbox? if they did, then why did they not replace the refridgerant OR AT LEAST inform me. prior to this the same dealer changed my compressor under warrantee which is less than one year. what should i do?