As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOTHROTTLE ARM LIGHT ON MCP PANEL INOPERATIVE. AUTOTHROTTLE WORKS NORMALLY. ACFT GROUNDED. ACFT HAS 4082260-939AS MODE CONTROL PANEL INSTALLED, AND A/T ARM LIGHT INTENSITY IS CONTROLLED BY CAPTAIN'S INSTRUMENT PANEL LIGHTING RHEOSTAT. WITH CAPTAIN'S LIGHTING RHEOSTAT SET, PERFORMED AUTOTHROTTLE OPS TEST IAW MM 22-31-00-710-801. ALL TESTS PASS.