What was found
NUMBER 1 GEN INOPERATIVE DUE TO MEL. APU AUTO SHUT DOWN 30 MIN INTO FLT AT 290 RESULTING IN SINGLE GEN OPERATIONS. AFTER DESCENDING TO FL210, APU RESTARTED RAN OK RTB MEMPHIS. CLEARED FAULTS IN ECB, RAN APU IAW AMM 49-61-11-04 COULD NOT DUPLICATE FAULT. REPLACED ECB AS PRECAUTIONARY IAW AMM 49-61-11-04, OPERATIONS CHECKED GOOD.