-400 rated not 777, but looks like C1 EEC right engine failed then C2 struggled with the EPR possibly due to missing ducting, corrupted data I'm outta here resulting in EEC R which means N1 mode? no A/T therfore no TAC? Is there any action required for the left engine in this case? On the -400 with an EEC failed we have to drive all the remaining engines into N1 mode by turning off the EECs.