[strangepumpkin]

** UPDATE **

So, Apple replaced the logic board, which did not solve the problem. They then decided to switch out the second graphics card. I guess there was some confusion initially at the repair shop over which graphics card to replace. A or B. The first time, the shop replaced "B" but the Apple engineers had specified "A". So, I just got back the MP today with a new graphics card "A". In summary, over the last 30 days the MP has received replacement parts for Graphic cards "A" & "B" and a new Logic board.

Crossing my fingers that the issue has been solved. I'll report back after a few days of running this thing through its paces.