As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN)LOOSE SCREWS FOUND INSIDE ELT. FRAME USED DURING CONSTRUCTION HAD HELICOILS MOUNTED OFF CENTRE CAUSING INSUFFICIENT THREAD ENGAGEMENT FOR SCREWS SECURING PC BOARD. FIVE UNITS FROM AFFECTED BATCH S/N'S107 THROUGH 263 RETURNED IN THIS CONDITION. SIL BEING RAISED TO ADDRESS ISSUE.