So pins 1, 2, & 3 are now 4.8V? That sounds more reasonable, but what about pin 6? 1.7V doesn't sound right.
The op-amp in the LM10, takes the output voltage of the power supply, compares it to the reference and adjusts the voltage to Q5's bas which in tern alters the supply voltage to the oscillator driving the step-up transformer. It's an error amplifier.
Measurement errors aside, I suspect one of the transistors is faulty. The gain is probably lower than it should be, or it's leaking, so it still oscillates but doesn't reach the required output voltage. Have you tested any of them?