The folks at KPIX have yet to respond to my missive from last week. So, I sent them another email just to make sure there isn't a technical problem that I don't know about. A technical snafu would be easier explained than management of a local TV station that happens to be owned and operated by the CBS network ignoring a viewer's concerns about its reporting. Still waiting.   March 10, 2009 Dan Rosenheim News Director KPIX-TV5 855 Battery St San Francisco, CA 94111 VIA Email Dear Mr. Rosenheim, I am writing in an attempt to confirm receipt of my letter of concern dated March 6, 2009. I contacted you in order to draw your attention to issues found in reporter Sue Kwon's march 5th package on mercury in canned tuna. In case you did not receive my original letter please find a copy of it attached. Thank you for your attention to this matter. Gavin Gibbons National Fisheries Institute cc:        Ronald Longinotti             President and General Manager             Lisa White             Assistant News Director