What was found
RT ENG EFC FAIL LIGHT ILLUMINATED SEVERAL TIMES IN FLIGHT WITH RPM ROLLBACK ON THE RT ENGINE. EFC RESET SUCCESSFULLY TWICE, THEN WOULD NOT RESET THEREAFTER. TROUBLESHOT IAW MM 76-10 & 73-20, ASSISTED BY MFG TECH SUPPORT. REMOVED THE LT & RT EEC & T/O PROBES BY THE SUGGESTION OF MFG. LUBED EFC T/O POWER SOLENOID & STOP. ADJUSTED (RT) EEC AUTHORITY FROM 8.8 PERCENT DROP TO 5.5 PERCENT DROP PERFORMED MX IAW MM 76-10 & 73-32/ 72-00. OPS CK GOOD.