Methyltransferase which mediates trimethylation of 'Lys-78' of cytochrome c (CYC1). L-lysyl-[cytochrome c] + S-adenosyl-L-methionine = H(+) + N(6)-methyl-L-lysyl-[cytochrome c] + S-adenosyl-L-homocysteine The SET-like region, although related with the SET domain is not detected by any prediction method. Present with 2940 molecules/cell in log phase SD medium. Belongs to the class V-like SAM-binding methyltransferase superfamily.