Repair Pathos Logos Amplifier

Repair Pathos Logos hybrid amplifier for one of my customer. Right channel having problem of low frequency oscillating, at about 1 Hz. The customer sent to someone for repair, and the repair man returned it without repair anything. The power amplifier consist of 3 pairs Mosfets, a couple of BC557 and BC547, and an op-amp . a simple class AB amplifier design. I replaced a bad resistor and everything back to normal. Those Chinese ( JH ) electrolyte capacitors seems in bad condition too , so I'll replace them all .