funny spotting this thread. i have just finished soldering today on the HV section of a -22 SDB board for an EBD. TP2 and TP4 were both testing at 240+ and as per clays guide  - > rebuild time. Note that C23 is for the 5v section. I washed down the board with a 50/50 vinegar/water solution and fired up the desolderer. I used a bigdaddy enterprises kit. still got to do the regulator as i got interupted and then need to buzz out to make sure connections are good (couple of traces are jumpered). Ed at GPE also sells a HV kit. I also replaced a couple of the TIP102's. Query - I used diode MM test on the TIPS and when in circuit they test 45/49 - is this about right?? out of circuit is closer to 45/60 (grounding centre pin). will test the board in machi9ne tommorrow.