MACKIE PPM series 808M Amplifier Service

[TAC]

I'm servicing a MACKIE PPM 808M that channel 1 doesn't work but channel 2 is just fine. I've determined the input op amp (U3A - NJM4560M), is bad. This is the input op to the power amp board from the mixer board. Of course the part is obsolete. Anyone have any recommendation on which of the following similar parts I should use as a replacement?

NJM4565M
NJM4580M
TLC272BCPS

Also, how important would it be to replace the good NJM4560M input op amp on channel #2 with the same new op amp part number that I'm using in channel #1?

 

[Khron]

The 4580's a safe bet, and it won't hurt to replace the corresponding one on channel 2 as well (assuming nothing goes wrong during the operation, like physical damage to the board).