What was found
CLIMBING THROUGH 14,500', LOST FIRST OFFICER'S SPEED ALTITUDE, AND VERTICAL SPEED DATA, MACH TRIM FAILED, AND "SPEED REFS INDEPENDENT" STATUS MESSAGE APPEARED. RETURNED TO LAX.REPLACED NR 2 ADC IAW MM 34-13-00. OPERATIONAL CHECKS GOOD. PN: 822-0372-445 SN OFF: 12DLD