Technics SU-A8 preamplifier, no sound, help please!

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Hello everyone,
Just bought this preamp on ebay as a non-working unit. It powers up, everything lights and works, but when a source is connected to either the AUX ou TUNER inputs, there's no sound. 🙁 The tape inputs, both TAPE 1 and TAPE 2 work fine. I currently don't have the schematics. My guess is that it could be either a bad solder joint or a transistor? Can I test the transistors in the circuit or should I take them all? Sorry for the limited knowledge, any help will be appreciated. Thanks.
 
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