As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK DUE TO LT ADC FAIL AFTER ROTATION. INDICATIONS WERE: I INOP FLAGS ON L AIRSPEED L ALTIMETER AND L VSI EICAS MESSAGES WERE RUDDER RATIO AND MACH TRIM. GPWS ACTIVATED. AUTO THROTTLES SURGED. R & R LT ADC IAW MM34-12-01-4. LT ADC OP CK GOOD IAW 34-12-01-4 AND FIM 22-00-03 FIG 117 MCDP TEST 30. C/W ADC TEST IAW MM 34-12-01-4 AND MCDP TEST 30 CURRENT FAULTS CK GOOD. C/W BY CAT QUAL AMT.