It could be as simple as removing the screws and checking / cleaning the seal and reassembling with a bit of faucet silicone. Or, it could be a cracked case / housing. The big question, for me, is it better to replace if I am going through all the effort to pull and check the part.
These pumps are actually very robust. I have cleaned and reassembled them and they usually stop leaking and work fine. A bit of silicone (flexible gasket type) and being careful with tightening the screws, tight but not too tight, works if the case is not cracked. If the pump cover is cracked, parts are available for repairing. And rebuild kits are around. Again, it is just what is worth the time and effort when a new pump is around $100.
Re: right next to the inverter - Yeah, I have NEVER understood why SMB did this in many of their builds. It is a situation where a water system failure/leak can cause really serious damage.
Beastie 3: 2002 7.3 EB Cargo: Agile TTB, CCV Mid Top, Custom Walk Through, Lots of stuff added. BlingMyRig.com