What was found
DURING CLIMB, THROUGH APPROX FL 320, NR 2 ENGINE PARAMETERS BEGAN FLUCTUATING. N1 VARIED /- 3-5 . TURNED AUTO THROTTLES OFF, REDUCED THRUST, FLUCTUATIONS CONTINUED. LEVELED OFF FL 350 FLUCTUATIONS SLOWLY DISSIPATED TO NORMAL WITHIN ABOUT 30 SECONDS. FIRST FLUCTUATIONS BEGAN WITHIN A MINUTE OR 2 OF TURNING OFF CENTER TANK FUEL PUMPS. NO ENGINE PARAMETER EXCEEDANCE NOTICED. ACFT GROUNDED. PERFORMED E/A 800-73EA-11198, STEPS 1, 2, 3, STEP 2 REVEALED FAULT CODE 73-20332 FMV DEMAND AND POSITION SIGNALS DISAGREE. COMPLETED E/A 800-73EA-11198. ACCOMPLISHED NG-28EO-00002 SPECIAL WATER MANAGEMENT PROCESS FOR NR 1 AND NR 2 MAIN FUEL TANKS. ENGINE RUN AND BITE CHECKS GOOD.