Conductor plate is easy to change on 722.6 and can be done by mere mortals. As opposed to the 722.9 that requires a dealer.

I would go ahead and drop the pan and do a fluid/filter change. Be sure you're using the correct fluid, it is not ATF. Either the MB Spec fluid or the Pentosin equivalent.

You will need the Dipstick Tool and the red anti tamper clip to seal it back up when you're done. You are supposed to measure the transmission temperature with Star Diagnosis but an IR thermometer on the pan will do just as well.

Also do the connector plug while you're in there.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech