1996 Sierra K1500 code P1441

The service tech at the dealership says that code P1441 indicates a "purge system error", and that I should check the "emissions purge valve and connections". I'd be glad to; if I knew where to look.
ILLEGITIMATI NON CARBORUNDUM! Here’s a diagram form a service manual showing some of the EVAP components.
Dan.

(1) EVAP Canister Purge Valve
(2) Manifold Absolute Pressue (MAP) Sensor
(3) Positive Crankcase Ventilation
(4) To Fuel Tank
(5) EVAP Canister Vent Hose
(6) EVAP Canister
(7) EVAP Canister Vent Valve
(8) EVAP Service Port
(9) EVAP Canister Purge Hose
(10) Throttle Body