A company hired by PG&E to check its lines found the valves were not able to vent excess pressure at stations in Sacramento, San Joaquin, Stanislaus, Colusa and 10 other counties.   Workers should be done improving the ventillation of the valves by connecting valves to the vent stacks in those locations by the end of Wednesday.

But, Brittany McKannay with PG&E says investigators are looking at other issues with the release of pressure and the installation of wiring at the stations.

MCKANNAY: "That has to do with what the set point is when we relieve pressure and also part of the electronic installation that takes place in that facility and whether or not that is compliant with the National Electric Code."