Following up this article ..Heating gauge was lost
Tepco is asserting the heating gauge set on the bottom of the reactor is broken because other 2 gauges are showing 31~34℃.
However, there is another heating gauge to show the increasing temperature.
It’s attached to the CRD Housing, where is under the container vessel. (CRD = Control Rod Drive) 
This gauge showed temperature over 150℃ on 1/14/2012.
It’s showing the increasing temperature toward 2/13/2012 with the “broken” gauge.
Iori Mochizuki