Theres probably a protocol in place that dictates that any info found is sent to the situation controlling agency then a controlled/verified/spun release of the info would be made. I think it would be quite improper for RR or Boeing or the Comms vendor to make a statement without either being invited to do so or given the permission of the Malaysians at this time. There are still relatives to consider too.
There are probably client confidentiality agreements in place that prevent RR or Boeing from making statements regarding systems telemetry and so on. It wouldn't be their place to do so publicly anyway, any information would be passed to the Malaysians or whoever was leading the investigation and then broadcast from there if deemed fit to. That's the way it works with many other vendor / supplier agreements of this magnitude.