dead OP-AMP in Casio MT-45

[wax+wire]

Hi guys.

from all accounts, the op-amp in my casio MT-45 is dead.  I can get a proper audio signal if i tap it just before the IC, but no sound out of the speaker/headphone/line out.

The chip is seems to have no info on it self out their. LA4138

It is a 14 pin chip with a big heatsink on the end.  9V.

thoughts on replacing it.

[Circuitbenders]

Typing LA4138 into google just bought up 311,000 results!

Its a 2.7 watt power amp.

Theres 10 listings for them on ebay right now

[wax+wire]

i lose at the internet.

i'm sure i typed it.

forgive me and my failings :->