As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LEFT TO/GA BUTTON ON THE THROTTLE CONTROL STAND DOES NOT ENGAGE TO/GA MODE. THE RIGHT SIDE SWITCH OPERATES NORMALLY. GROUNDED - YES. ACCOMPLISHED B37-900 FIM 22-32 TASK 804 FOR TO/GA SWITCH OPERATIONAL ISSUES. DISCRETES SHOW SWITCH IS OPERATING NORMALLY. PERFORMED DFGS BITE TEST 35 DUAL AND TO/GA SWITCH OPERATION NORMAL. FIM DESCRIBES THIS FAULT AS INTERMITTENT AND OK FOR SERVICE.