As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT AND RIGHT EEC INS IN THE ALTERNATE MODE EEC BIT #1&2 BOTH HAVE F0 D6 ED. PERFORM FIM 73-21TREE802 AND AMM 73-21-00-902-001-R01 #1&2 EEC BITE BOTH #1&2 NO FO FAULTS NOW F1 FAULT D6. ENGINES BOTH FO D6 FAULT INDICATES DIFFERENCE OF 252 FT. ALT L/R ADC''S REF. L/P8452657 DISCREPANCY. RESET EEC AND LIMITER SWITCHS TO NORMAL. RAN #1&2 ENGINES LIGHTS REMAIN EXT. NO EICAS MSG..