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Hi Carlton,
The input selection problems on your A3 at startup and then for a few cycles certainly suggests a powersupply/aged capacitor issue, but could also be something to do with switch/relay contacts or even an intermittent contact or circuit trace that changes (improves) as the unit warms up. Capacitors though seem very likely and you can likely know for sure before changing them especially if they are oozing any liquid/gel gunk from their vents or on to the circuit board, or their case is split open usually at their tops or their Equivalent Series Resistance measured by a special meter is highervthan expected. If you need to change capacitors ask your tech to check the ESR in circuit first to help verify that it is a capacitor related fault and also replace the capacitors whilst he is at it with a Low ESR type of the highest temperature rating for potentially longer life and better performance.
Best
JA
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