1978 450sl kept overheating, we knew we had an anit-freeze leak, just couldn't figure out where it was coming from. Finally found a leak around the servo unit. Does this mean the entire unit needs to be replaced, or is it repairable. Hubby is quite handy around old cars. Repaired a 1969 VW, from A-Z when daughter had one. Just don't want to have to send $400+ for a new servo if this one can be repaired. Hubby also has an electrical background if this helps. You can email me privately @ tdr1004@GMAIL.COM THANKS EVERYONE!!!