Overtemp errors

SR 48 with CEM3 current software ver

Had change over from previous show, focused Wednesday and programmed all day yesterday without incident.  About 2:10 this afternoon, 19 circuits all went overtemp.  They were all on same phase (bottom of rack) so my HOPE is that local power company had something happen that the rack responded to with overtemp errors.  We were having heavy rain but little lightning/thunder.  CPU temp was 77 F so don't think there was really a temp problem.  Problem phase has 2 ThruPower, 3 relay, and balance D20AF modules.

Hope this does not repeat but appreciate any insights that anyone may have.