By DÁNICA COTO, Associated Press SAN JUAN, Puerto Rico (AP) — Shuttered businesses. Sleepless nights. Canceled classes. Hundreds of thousands of people across Puerto Rico remained without power on Friday, nearly two days after a fire at a main power plant sparked an island-wide outage. Crews have restored power to some 650,000 customers out of nearly 1.5 million, but people in several neighborhoods