TOKYO (Reuters) - Japan's Toshiba Corp said it has asked regulators to extend its Tuesday deadline for official third-quarter earnings for a month, as its expands a probe into problems at its U.S. nuclear unit Westinghouse.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=mpKwhSOzd7I:jc4DNAFGaDE:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=mpKwhSOzd7I:jc4DNAFGaDE:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=mpKwhSOzd7I:jc4DNAFGaDE:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=mpKwhSOzd7I:jc4DNAFGaDE:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=mpKwhSOzd7I:jc4DNAFGaDE:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/mpKwhSOzd7I" height="1" width="1" alt="" />