GP
there are only two switchs at drier.
one is low pressure switch(black) one is aux fan switch(red)
I will pay someone to do it,it's not a fun DIY job.....it could hurt your back and neck
been a thch for many many years I still hate
to replace expension valve if you don't have the right tools.......I only can tell you....
GOOD LUCK !!!

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MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner