As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APU ISOLATOR MOUNT REPLACEMENT IT WAS DISCOVERED THAT THE ORIENTATION OF THE VIBRATION MOUNT HAD BEEN INSTALLED 90' OUT OF ORIGINAL FITTING. THE APU HAD TO BE RE-REMOVED AND ADDITIONAL CHARGES INCURRED FOR THE LIFTING KIT. ROBUST INSPECTION POST ASSEMBLY WOULD HAVE CAPTURED THIS, OR POSSIBLY THIS COULD BE A ROGUE PART.