There shouldn't be any fluid in that area unless you spilled it. Liquid that gets down in there will boil off and can bubble, it's normal. Don't read too much into it. If you didn't spill the fluid down there, fix your leaks.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)