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112RP 100 Phasor help needed

I just picked this amp up in a trade and it's just about pristine. Everything works great except the phasor. Judging from everything I've read on here there should be a trimpot in the phasor circuit. The only trimmer I see on my board is the bias trimmer. Am I blind? I'll attach a pic. Btw my board number is the GP1 and the chassis number is 2100. Thanks.