[Elecraft] VOLTAGE PROBLEM ON MY K2

[EFMM]

Hello to all
I build my K2 (S/n 4133).Work 100% on received mode,but on tx mode have the nexy problem....Hi current.I check all,and i find that my K2 is on TX the collector of Q2 on Control Board have 3' 52 volt.I removed this transistor (2n3906) and i put another new,but the problem is the same,I check the D6 also and is good.Need help.
Thank you all of EA7HG,Eugenio