Stetson Call

Hey guys. My car threw the P0128 Code on me on my way home tonight. (M156)🙄😂 Not an issue, it's not the first time I've had a mercedes throw that code lmao. Seems pretty seemingly easy for them to throw it; so with that being said, I'm going to replace the thermostat and the expansion tank line so the line isn't getting brittle in the future and start puking coolant everywhere while going down the road. (Granted thats better than headstuds going out and flooding the engine with coolant) ((also mine is a late 2011 so its had the update headstuds)) Does anyone know the parts #'s to those two items so I can get them ordered as soon as possible? Rather does anyone know the part number to the expansion tank line. I can find the thermostat one easily. Had some issues finding a part number for the expansion tank line. Thank you all! 😁