Got a '99 E300D that has a refrigerant leak. See attached photo. The only leak appears to be the lower hose - that green stuff you see is the UV dye. So if I'm getting into this work, what else should I do? I plan to replace the hose as well as the seals for that hose and the receiver/drier. Should I mess with any other seals or anything else while I've got the system open? Is this a reasonable DIY job? I'd farm it out to vacuum the system and refill it. Other than that I'd hope to DIY.

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Len
'59 220S Cabriolet-SOLD and living happily in Malta
'83 240D 351,500 miles original owner-SOLD
'88 560SL 41,000 miles - totaled and parted out
https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 227,500 miles
'03 SLK320 40,000 miles - gave to my daughter
'14 Smart electric coupe 28,500 miles
'14 Smart electric cabriolet 28,500 miles
'15 Smart electric coupe 28,000 miles