As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUSE,RIGHT AUTOTHROTTLE STAYS AT IDLE WHILE LEFT ADVANCES ENOUGH TO THROW PLANE OFF COURSE. AFTER SAFE LANDING MTX DEFERRED THE AUTOTHOTTLE SYSTEM IAW MEL 22-30-1. MX PROCEDURES COMPLIED WITH PLACARDS INSTALLED MBCB 11/24/25 REF. LOG PAGE 39215-93/1 A/C RETURNED TO SERVICE