Ok, had several "fires" to take care of, hope no one else has to deal with Holidays like mine have been...
Onto the task at hand...
Wanted to point out to you, the issues of L50, C60 and those areas in the corner of where the PLL sits.
Might want to find a good, SOLID KNOWN GOOD grounding point to help you lessen the likelihood of false reads.
This corner section is case and point. RF shows up over here - in both the 10.240MHz kind as well as in the 36MHz realm as you have been seeing while you probe. This may put you and your readings into a bad light of off the chart voltages - all because RF presence in this region is pretty high - it needs to be - but you can't use or measure in this area unless you're using the right TP locations.
So, if you can - find some shield can or two paired together - and bridge them with a wire stem cut from some component =- put it in as a bridge to help you CLIP onto it your negative lead as you then have a less tedious and more hands-free tie-up to let you and the live probe (red lead) side to tap and tie into sections without worrying about the noise level raising the readings to give you phony results.
You found one area that is doing that right now, TR23, your one you've asked about 9 volts - yes, that's too high.
It can be from the "RF loop" this Tripler generates between the coil it "rings into" and the part that is the 1K and 0.01uF (103 Disc) - this area is a small transmitter - it can leak RF into your readings and be rectified thru the probe, meter or the parts your looking at - so again, focus on finding a good RF and DC Ground at the CENTER or near as possible to the CENTER or by the Power supply filter.
TR23 - pull that part and check it - it is a 1675, you can try a 1730 if in a pinch, but the 1675 has a pretty high Hfe as well as RF frequency range component versus the 1730 which can add noise unto itself doing this type of function - it makes a lot of square-waves if these two are pushed too hard. Both are high bandwidth amplifier parts - but work best in the uW (Micro) or mW (mili) watt scale.
The 1K sets the DC bias gain values, but the 0.01 (103 Disc) sets the upper RF limitations - so if its' going faulty - this would be suspect too - from simple drift off in values as it ages.
It's (Tr23 - Whole strip there in your graphic really) only trying to generate enough RF to make the Tripler work into the 35MHz range - not generate spurries above 70~80MHz (3rd harmonic of 27MHz) so if the caps gone shorted, it will look more like a DC short and will damage the transistor - so check that part against a known good one to make sure you are not getting bad readings.
You're having issues with more of the age of the assembly, so it's going to be touch and go for a while on this patient until the life-signs start getting more stronger and stabilize.
We're here as we can be - working right along side ya'.
