Wow, you did a lot, now you'll have to go back and double check the work you did.
Ok, remember that Truth Chart I posted in this thread? The 2nd one in that post, note the TP1 frequencies...
When you hear white noise - think thru the areas you worked on, you may need to go back and use your scope to determine if you have the frequencies listed on that Truth table chart.
You see modulation - you may have soldered a cap back in, but it may not be correctly installed or the right value.
As per your post, I'd look into the Receiver side. You have your PLL generating a approximate 34 to 35MHz signal - you seem to have channels, and you seem to have modulation - the only way to truly know that is to have another radio set up to monitor - you'd hear your audio thru that radio when you're listening on the same channel your talking on - when you key up your 2000...
When you receiver is quiet, it sounds like you've disconnected a cap or replaced that cap incorrectly - it's not sending signal to help you find the channels.
The PLL - it pipes Intermediate frequency (your IF from L20) to the Receiver side - if that signal isn't there, you don't have any receive - it just sits there and you hear a white noise hiss from the rest of the radio waiting to have a signal sent into it.
TR15 is your main Receiver 1st IF amp - it uses that 34 to 35MHz signal here, you have a cable that routes to it from L20 and that big shrink wrap area of parts by it.
Might want to make sure you've got your parts back in right.
