What was found
INSPECTION TYPE:N/A**ATB ** - L ENG FUEL FILT AMBER MSG APPEARED DURING CLIMB. AMBER MSG DISAPPEARED AND RETURNED BRIEFLY AT MAX CRUISE THRUST. L ENG FUEL FILT WHITE STATUS MESSAGE APPEARED AND REMAINED FOR REMAINDER OF FLIGHT. THE AMBER EICAS MESSAGE RETURNED BREIFLYREMOVED AND REPLACED LEFT ENGINE FUEL FILTER ELEMENT PER M/M 73-11-02 SECTION 3 THIS PAGE FOR TEST [ MB 0557925 10/15/21] REPLACED FUEL FILTER DIFERRENTIAL PRESSURE SWITCH REF AMM 73-34-01. OPS CHECK LEAK CHECK GOOD. PERFORMED TEST OF L/H ENG FUEL FILTER REF AMM 71-00-00-995-229-H03