Replaced Shower Cartridge, but Leak Persists. Help!

Hey guys,

So I noticed a leak on my Delta 1400 Series shower and neighbors in my condo suggested that I change the cartridge, so I did just that (Cartridge is a Delta 46074). I even cleaned out the pipes and I also replaced just the rubber cups/seats and springs within the cartridge, as per Googling results, but the leak still persists! Would buying a new trim or spout do anything? Can anyone give any advice on what I can try next? It would be much appreciated.

submitted by /u/BryB33
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from DIY https://ift.tt/2NILRcT