BUZZ-Petroleo Brasileiro Petrobras SA: Shuts down unit
** Brazilian oil company's U.S.-listed shares down 9.7 pct at $14.87 premarket
** Says its Pasadena, Texas refinery had shut down its gasoline-producing fluidic catalytic cracking unit for a planned overhaul lasting between 20 and 25 days
** Says the 100,000 barrel per day (bpd) refinery will now operate at about 90,000 bpd
** Up to Friday's close, company's shares had risen more than 19 pct this year
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