This report in the Mainichi Daily News details the temperature changes and irregularities at the No. 2 reactor.
http://mdn.mainichi.jp/mdnnews/news/20120212p2g00m0dm20000c.html

The last I have seen (Feb. 2) on the No. 4 reactor is that 8.5 tons of radioactive water leaked from it, but was confined to the reactor building.
"The No. 4 unit also* lost the function to cool its spent fuel pool, but no serious damage is believed to have occurred in the fuel stored there."
* No. 1-4 lost cooling functions early in the crisis.
Mainichi Daily News, Feb. 2, 2012.

On Feb. 9, the same newspaper reported that "the Nuclear and Industrial Safety Agency has declared that the primary evaluation of the results of the stress tests on the plant's No. 3 and 4 reactors, stopped for refular inspections, are appripriate [for restart]. The Nuclear Safety Commission is set to decide whether to issue permission for the reactors to restart."