Hi if u have checked everything out
the only thing left is to replace the
IC.amplifier chip which is bolted to the large silver heat sink...when u replace make sure u put some new heat sink compound on the IC ..if u don't know how to use a soldering iron properly don't attempt to do it u can easily destroy the new IC chip with heat .cheers 
SOURCE: Technics SU-G91 OVERLOAD PROBLEM
I had the same problem. As soon as the volume reached about 24db it would go into overload. I was able to fix it by soldering all the connections on the larger power module. The one connected the the heat sink. When I took it apart there where several solder points that had come loose.
SOURCE: Technics SU-V2 keeps cutting out
An amp will cut out if the output protection circuit kicks in. This circuit compares output power against the preset level. Each channel has it's own, independent protector. There are calculations that can be done, but for a novice the rule of thumb is to "never use a speaker with a power rating less than the amp AND a lower impedance than stated". Typically using a 4 ohm load on a 8 ohm system is inviting disaster. Even if the system does not become a smoke generator, you might notice that though "louder", the sound quality is deteriorated. Many "audiophiles" often hook up some combinations of speakers to have "surround" without really understanding that the collective impedance actually changes (generally lowers).
SOURCE: Technics SU-G91 Left channel bad
Did you ever find the solution to the left channel issue? I have the same problem with mine.
SOURCE: sound from one speaker only.
your output stage had a problem in electronic output device and must be maintained in service center.
SOURCE: My technics amplifier su-g86 started
Most of the time this problem is caused by bad solder joints.
All the units I have repaired all that was needed was to reflow the solder joints.
The most common place is the leads of the hybrid IC.
Usually there are very very fine cracks which can barely be seen with a good magnifying glass.
I usually go ahead and resolder most of the solder joints related to the output section.
Basically the mechanical stress of the heating and cooling causes this as well as the manufacturer trying to use as little solder as possible.
Hope this helps,
Richard
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