As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU RELIABILITY COLD START ATTEMPIED ON FLIGHT LEG SCK -BDL SAT -58 FL 370 3 ATTEMPTS UNSUCCESSFUL (<P>APU TRANSFERED TO MDDR 108569 IAW MEL 49-11-01A CAT C DUE 22MAR19 </P><P>REF LOG PAGE 1058279 REMOVED AND REPLACED APU CONTROL UNIT IAW AMM 49-61-05 AND OPS CHECK IS GOOD AT THIS TIME , MDDR # 108569 CLOSED </P>)