I like the blue led fuse style units. Make sure to use a good defuser paper.
DC offset your only adjustment. I believe you can check your bias across 753/4/5/6 emitter resistors. your looking for 40 - 50 ma across the resistors. Dividing the voltage by the resistance should give you the current.
If i am not mistaken, if everything is correct in the amp, there is a way to set r719 to +/- 0.6vdc
which should set your driver (q713/714)base voltage @ -/+0.6vdc
R732/733 are iirc diodes with resistors in parallel.
As Tom said, the circuit sets the bias, but it would be nice to check it before you experience thermo runaway.
According to Dr*Audio, and i quote
".R732 and R733 are used to adjust the bias. They must both be changed at the same time, using the same value. Raise the value to lower the bias current. Small changes in value make a large difference in the bias current. You will probably need to use 1% resistors to get it close. Order some values around 8.2K, above and below, to have them on hand. Remember you will need 4 of each value."
This info is an accumulation of wisdom i had gathered from postings by Tom, (cat), Dr*Audio and Ron(jblmar) back when i worked on my 300dc.
FWIW,
The Driver heat sinks on these units get hot as hell. That appears to be normal operation. I am thinking 130 deg or so.