Not dead. It just had a HT fault. You can tell by reading the front panel. Cycling the power usually fixes this.
MOPA is back onliine. Rana found that the fuse in the AC power connector's fuse had blown. This was evident by smelling all of the inputs and outputs of the MOPA controller. The power cord we were using for this was only rated for 10A and therefore was a safety hazard. The fuse should be rated to blow before the power cord catches on fire. The power cord end was slightly melted. I don't know why it hadn't failed in the last 12 years, but I guess the MOPA was drawing a lot of extra current for the DTEC or something due to the high temperature of the head.
We got some new fuses from Todd @ Downs.
The ones we got however were fast-blow, and that's what we want The fuses are 10A, 250V. The fuses are ~.08 inches long, 0.2 inches in diameter.