There was no sealant on the awning wiring penetration on our 2552 either and I found some damp underlayment by the passenger seat. I don't know if the awning mounting gear is the cause, but it seems to be the most likely suspect. I dabbed sealant around the exposed wire penetration as it looks like any water falling down the awning mount channel would ride the wire into the coach. Your fix looks much more professional.
Based on the comments of another owner, I also dropped the bottom wedge out and found the 3 sheet metal screws holding it in place are not weather sealed either. I put sealant on these screws too. You can reach the bottom screws as the wedge is hollow. I dabbed some sealant on the stern side wedge of the awning too figuring if water is getting in the bow side, it's probably getting in the stern side as well. Mark