Loss in boost and CEL P1104

[adidasdudegst]

Ok, so I have a 1999 Eclipse GS-T w/ 3" turboback catless, UICP, NGR Type S BOV, K&N Filter and aftermarket intake pipe... I was running 15psi steady on the stock turbo for quite some time... Just recently I noticed it go down to around 10psi range and lower... I did a BLT and found no major leaks, and I am still getting around 20-23 in vac. However, the car finally threw a code P1104, which according to the chilton manual, its the turbocharger wastegate solenoid malfunction, or I've otherwise found known as the boost control solenoid. Would this be a cause in my loss of boost? I'm going to get a new one regardless, and more then likely get a manual boost controller fairly soon. It sucks, because the car feels so sluggish when its only aroud the 7-11psi range.