Crown CE2000 PA Amp Question - thermal glue?

[PfeifferElectronics]

I am repairing a crown CE2000 amplifier. There are four transistors encased in what looks like silicone glue; attaching them to the power transistor heat sink. I'm assuming this is to draw away heat. However, I don't know what was used to 'glue' them in place. This is not thermal grease/compound because it is hard/rubbery. These are bias transistors 2N3904 (Q104,Q204). What is this glue and where do I get it?

Thanks

[Jazz P Bass]

RTV.
It's not a silicone glue,
it's silicone. Like silicone caulking.
That's how it gets when it cures.
Rubbery.

Here is the assembly note: CE2000 RTV.pdf

[PfeifferElectronics]

ok, thanks. Replacing that transistor didn't solve my problem of -35 VDC on channel two.

Here's the story:
On initial testing, Found -99 VDC seen on channel two speaker output. After removing circuit board discovered Q232 transistor was burnt/broken and C223 cap bulging.

I've rebuilt negative side of channel two replacing Q223-28, R267-R272, R407-R412, D215, Q232, Q231, C223, R259, R400, R265, Q220, Q221, R261, R262 : Now getting -33.8 VDC (dropping slowly) on channel two output. Replaced D214, D215, Q204, R284, Q212. Still getting - 35VDC. Thinking I need to rebuild the positive side of channel two but resistance readings seem to match negative side. (base to emitter & case to emitter on MJ21194). What am I missing?

Search for Crown CE2000 on google for service manual. Don't know how to post a .pdf here.

Thanks

[Jazz P Bass]

How about a few voltage measurements?

Start with Q104 & Q107.
EBC.
Q108 & Q109/
EBC of both.
Then complete the picture with the driver transistors.
Q110 & Q112.
Q120 & Q121.
Lastly, Q111.

After all that, study what you observed. Something will leap out at you.

[Jazz P Bass]

CE 2000_B_sch.zip

[PfeifferElectronics]

setting up test environment tonight.... have to extend conductors so I can take readings when board is out of chassis. thanks so much for your help. I do this part-time for local musicians.. always learning.