Jolins

Hey there, I just bought an 05 Rx8 with the check engine light on. The code determined it may be the secondary air injection system issue but taking a further look at it, it may be an electrical system issue instead. One of the three plugs (blue one) has melted a bit (picture attached below) but I’m not quite sure how to begin searching for a new one. One shop tried to sell me an entire wiring harness which I doubt is necessary. Any help in directing me where to find one or the proper name for what I need to search for would be greatly appreciated. Thanks in advance!!

Need a replacement for the blue pigtail above