As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1421, PHL-SJU. RETURNED TO FIELD. ON CLIMBOUT FUEL FLOW INDICATION INDICATED A FLUCTUATION OF BETWEEN 1800-8000 LB/HR ON ENGINE NR 2. PREVIOUSLY WRITTEN UP. R & R NR 2 ENGINE FMU, REF AMM 73-22-52. OPERATIONS CHECK OK. PERFORM HIGH POWER ASSURANCE RUN AND NO FLUCTATION NOTED. A/C OK FOR CONT SERVICE SEE ITEM.