* Fed expected to stand pat on interest rates
* Alphabet jumps on record profit
* Microsoft shares down on valuation
* Dow down 0.35%, S&P flat, Nasdaq off 0.23% (Updates prices to early afternoon)
By Shreyashi Sanyal and Shivani Kumaresan
April 28 (Reuters) – The Dow and Nasdaq indexes fell on Wednesday as Amgen and Microsoft weighed, while investors focused on a Federal Reserve meeting for updates on monetary policy and waited for another batch of earnings from big…
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