As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WILL NOT START. TRANSFERRED TO MDDR NR 140596, IAW MEL 49-11-01A CAT C DUE DATE 17JAN 21 MX ACTION C/W. PERFORMED APU BITE, IAW B767 FIM 49-11 FT 958, NO DEFAULTS. THEN STARTED THE APU. APU STARTED IN THE FIRST ATTEMPT. ENGINE RPM & EGT PARAMETERS NORMAL. THIS CLEARS DMI NR 140596.