As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 N1 WAS 10 PERCENT BELOW NR 1 N1 AND NR 3 N1 WITH THE THROTTLE AHEAD OF NR 1 AND NR 3. NR 2 N2 WAS SAME AS NR 1 N2 AND NR 3 N2. FUEL PRESSURE FOR NR 2 WAS FLUCTUATING BETWEEN 100 TO 120 PSI. RETURN TO SFO. *S/D* FOUND DAMAGED WIRES AND CORRODED CONTACTS AT AN ENGINE MOUNTED TERMINAL BLOCK. REPLACED DAMAGED WIRES AND CLEANED CORRODED CONTACTS.