Have you checked the level of the trans fluid? If the level is on the low side you might want to check if the electrical connector on the trans is leaking. On my E320 this caused the trans fluid to wick-up from the electrical connector to the trans computer board through the wires. The fix is to replace the o-rings on the electrical connector, clean the circuit board if it is wet from the trans fluid and bring the trans fluid level to the correct level.

If your torque converter has a drain plug then I would have changed the fluid out when you did the filter change.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles