As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
During climb through FL 29 the # 3 engine at fire wall thrust would only maintain 1.8 EPR N1 82 % EGT 480C N2 87% FF 3500, at 35 engine # 3 EPR 1.25 N1 65% EGT 470, N2 70% FF 2000 applied engine anti-ice and fuel heat with no change.Removed and replaced # 3 ENG FCU per MM 72-21-01 performed full ENG TRIM/PWR CHK per MM 71-00-00 all parameters normal OPS and leak CHK good.