As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT FROM KTOL NR ONE EGT ANALOG AND DIGITAL READ OUTS DROPPED FROM 700 DEGREE TO 420 DEGREE WITH FLUCTUATION PLUS/ MINUS 5 DEGREE, N1 AND N2 SIMILAR TO THE OTHER 3 ENG. ALL 4 THROTTLES WERE ALIGNED. THE CREW RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. MX REPLACED L/E EGT HARNESS. OPS CHECK GOOD IAW MM 77-20-4, ATI ERH 70.01. ACFT WAS RETURNED TO SERVICE.