As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE B LOOP DID NOT ILLUMINATE ON TEST PRIOR TO FLIGHT. GROUNDED - YES. HIGH RESISTANCE ON THE B LOOP FROM M279 BOX. RESISTANCE FLUCTUATES DURING SHAKE DOWN CORE MW0326, FOUND THE TERMINAL BROKE AT RT CORE DUE TO CORROSION. REPLACED MW0326 B LOOP CORE HARNESS IAW AMM 26-11-02. REINSTALLED M279 BOX. ENGINE FIRE DETECTION OPS NORMAL.