How could this be? Some people use OIL that has the dye built in. So, if they replaced the drier, they added oil and hence dye. That is a simple one.

I would think that it is possible that the tech took loose the lines to flush the system and made a mess?

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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS