After replacing 2 bad relays (air pump, fuel pump) in my RCM works great now, I bought a brand new Mercedes OEM RCM as a spare. The new RCM had a manufacture date of 4/2015 so I opened up the new one and it had the same bad 3 solder joints. Repaired the new RCM and use it as a spare. The new RCM that I bought did not have upgraded solder joints. I wonder if the bad solder joints cause relays to over heat and fail, going to see how long the Repaired RCM lasts with the 3 bad solder joints repaired.