AUD/USD ventures higher to 0.7074, bouncing from 0.7038

Knocks on door to Bollinger uptrend channel at 0.7072

Wed close above will re-engage positive chart signal

Would add to bullish implication of hammer candlestick Tues

But USD might get a boost from Powell after FOMC decision

Fed chief may push back on market's hopes for ending rate hikes

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