If this is on the 126, it should be a simple matter of shifting the resevoir slightly toward the engine then lifting the outboard side. Once lifted, pull the assembly back toward you and up. You will be able to pull the reservoir out enough to disconnect the three electrical fittings. You might find that in your changing of the hoses, you pulled the pump assembly slightly out of it's socket, causing your leak. I had a bad leak on the 560 I'm working on, pulled the resevoir to investigate and found the pump slightly out of place. Snapping it back in cured the leak.
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.