Now this is interesting…
D28542 is apparently the hex color for Orange.
B = possibly second color in rainbow. Red, Orange, Yellow, Green, Blue, Violet, Indigo.
Also… according to this random thread that also popped up in my Google results, it apparently also appears in Captain Scarlett’s Pirate Booty next to Kitty Kream. Don’t have time to look into it now, but it may be another possible texture reuse (like the door graffiti). Also, apparently the code appears in Grand Theft Auto V at the top of a mountain
What about the code “B.A.T.H”? The Lieutenants names seem important. They relate to puzzles and fish.
Maybe we can find another one of those fish riding moments in that area? Maybe just another Red Kipper?