As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
**SUPPLEMENTAL SDR** IN CRUISE @ FL 380 L ENG N3 BOUNCED BETWEEN 9-85. ON DECENT W/THROTTLES AT IDLE L ENG N3 INDICATED 0. L ENG SPEED CARD STATUS MESSAGE REPLACED #1 ENG. N3 TACH GENERATOR IAW AMM 77-12-02/401. OPS CHECK NORMAL. RAN ENGINE IAW AMM 71-00-00-802-117-R00, LH ENG SPEED CARD STATUS MSG NOT DISPLAYED.