What part is that next to the battery in a 1996 E320 in an insulated housing. I see yellow hoses connected to it. my front left door wont close or latch. can push lock pin down. when i push central locking button it makes humming noise. my guess it looks like a vacuum/compressor for the locks cuz a yeelow tube goes to the locking mechanism. i checked fuses, and looks good. please help!!!!