Is this something I should tackle myself, I am pretty handy but am new to the Benz world and dont know all of the tricks. I dont want to set off the SRS bells and whistles. I let the battery drain last weekend and had ARS and SRS codes that I had to buy a code scanner to get rid of. Do Y'all have a source for discount parts or is the dealership the only option. Where can I get service manuals? I bought some off of Ebay on DVD but got scammed.