[JJH3984]

Well lets go street by street here:

Preflop: PB's range is significantly larger than his default 4 -betting range here. He isn't four betting some random tight passives. Maniac's range is large. I assume if the kid knows who PB is, he is at least a bad TAG so he'll know about isolation threebetting. TT+, KQs+, AQ+ depending on table conditions (if very passive, he might be able to cold call some big suited connectors for volume)

Flop/Turn: Well the flop raise only tells us that PB has a hand he'd like to continue with. The pot is big and only 3 way. I think PB is raising with most hands he'll want to play: mostly for value, but also in case UTG makes a mistake and folds. (He probably just calls with KKd-TTd) I think we can knock the PPs without a diamond off the list and all non-ace, non diamond having hands also).

The call of the third raise and raise of the turn tells us a bit more about the hand. I think PB should and would cap in this spot with hands that have good equity against the hand ranges of mp and especially utg. For this reason I think we can rule out flushes, big combo hands like AxQd, AxKd, and maybe AA. I can actually see PB playing AA in this manner sometimes. In any case, he should cap the flop with flush/pair-nut draws with a diamond.

River: AA and flushes both put in another raise here I think.

Conclusion: AK with no diamond, mebbe AQ no diamond.

edit: the turn raise almost eliminates KK and QQ from PB's range imo. What kind of hand is he hoping utg will fold? Retards don't fold diamonds in big pots. Looks like a raise to charge a draw to me.