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AC SYSTEM WENT DOWN AT 10 P.M. ON A HOT HUMID NIGHT. CALLED AND GOT SOME ADVICE OVER THE PHONE. FIRST THING THE NEXT MORNING, DIABASE FOLLOWED UP AND SENT A TECHNICIAN @ 11 A.M. DEFINED THE PROBLEM, FIXED IT, AND WE WERE COOL AGAIN BY THE AFTERNOON. GREAT RESPONSIVENESS AND A COURTEOUS AND KNOWLEDGABLE TECH.