What was found
WHILE ACCOMPLISHING T/C 78472000 ON NR 1 ENGINE, FOUND LOWER INBD BOLT MISSING ON THE OIL IN LINE TO THE FUEL HEATER SERVO. ACFT GROUNDED. HARDWARE FOUND ON TOP OF HMU. REINSTALLED WITH NEW GASKET REF AMM 73-11-07. PERFORMED LEAK TEST REF POWER PLANT TEST REF TABLE, TASK 71-00-00-800-811-F00. STEPS USED FOR GASKET REPLACEMENT AMM 73-11-07-400-801-F00, STEPS 5B, 1 & 2, 5C, 5E, 5F, 5J.