It would appear that the SAMs has some errors and omissions. The
Philips 7553 service manual should be used as the primary reference instead, with the SAMs as a back-up.
According to the 7553, the voltage at pin 1 of the horizontal output transformer should be 59V and 56V at pin 2, which is more or less what I'm getting. So, the h-driver circuit seems to be okay.
The beam limiter voltages are off:
Q661 emitter: 2.6V (0V)
collector: 3.4V (2.6V)
base: 0V (0V)
C661 is good.
The raster only straitens when I turn the G2 control all the way down.
Some other problems: C406 was bad, It's 10V-rated in an 8V circuit, so a 16V-rated replacement is preferred. C419 was bad, It's 16V-rated in a 14.5V circuit, so a 25V-rated replacement is preferred.