E500 squeaky suspension

[rugger1]

Recently purchased a used 2003 E500 roughly 50K miles, about 3 months later started hearing a squeak coming from the drivers side when entering/exiting the car, also when driving over bumps in the road. Only noticeable driving when windows are down and radio off but very noticeable nonetheless. Also hear it when driving at slower speeds over bumps and such. Any thoughts? It's actually at the service now and they are mentioning ball joints, just wondering if it could be anything else just in case. Thank you.