I just checked my transmission modulator and it it will not hold any vacuum. Fall to zero almost instantly. It's also leaking a little fluid.

I've ordered a new modulator, plastic pin, and a new cap.

I have read that it's a very tight job and to expect for the old push pin to break. I'll buy some tweezers in case I have to fish out the pieces.

After the modulator is installed I plan on adjusting the modulator using the DIY procedure.

Anything else that I have missed?

I also have a new trans filter and gasket. Should I wait to do those after or before the modulator? I was thinking I could change the modulator after the trans fluid is drained and before I remove the pan to change the filter. Is that okay?

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Replacing the modulator is an easy task, just make sure the area is clean.
you also have to replace the modulator seal/o-ring. you could do the transmission
fluid and filter change at the same time, and the k-1 accumulator spring if you like.

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1986 190D 5 cyl. 5 speed manual White (215K),
1983 300SD Silver blue (103K)