Drain plugs on the torque convertor of the M112/M113 were eliminated in MY2000.

Two options are: 1) 'solution by dilution' - repeatedly drain and refill the transmission (about 4 l) over a period of time. Pricey but easy to do or 2) have a dealer or indy use a fluid extraction machine.

I think that the important thing is to inspect the bottom of the pan for debris. A little fine grit is acceptable but anything bigger is cause for concern.