First, I agree that the leaking is probably the return hoses. Put your finger where they attach to the injector and, if is wet, buy yourself a length of new hose from the dealer (auto stores usually don't have the right size) and install it. Then see if you have a leak.
Pulling the injectors is very easy. Be sure you have a very sturdy vise and the proper sized wrench to get them apart, and do one at a time. Be sure to clean out the side hole in the tip with a very fine wire.

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'76 240D-Sold
'78 240D-Sold
'85 300 SD, 165K-Sold
'88 300 TE, 165K-Sold
'64 Porsche 356C Cabriolet- under restoration
'86 560SL 124K Miles-Sold
'94 320E Wagon, 74K Miles-128K Miles JUNKED
'06 E350 Wagon, 84K Miles
07 SL550, 14K Miles