What was found
(CAN) 45 MINS AFTER DEPARTURE, LEVEL CRUISE, RT ENGINE AUTO DECELERATED. ACFT YAWED THE THE RT. N2 WAS OBSERVED AT 52 PERCENT THEN THE ENGINE AUTO ACCELERATED BACK TO NORMAL PARAMETERS. REPLACED RT ENG HMU IAW T/C B767-73-21-14-004-001-00-H-FBAA AND T/C B767-73-21-14-404-030-00-H-8F90. ITEMS 1 TO 12, WP/MR AC69266, I/C AC063581, ITEM 13 AC084185 FLIGHT DATA RECORDING PARAMETERS INDICATED N1 AS LOW AS 57.6 PERCENT RPM , N2 AS LOW AS 79.4 PERCENT DURING THIS EVENT.