Thanks to Jason at DBSTalk here at the release notes for the new L226 942 software.
* Off-air DTV tuning enhancement to reduce loss of signal occurrences and macroblocking under good signal cases
* Improvements to eliminate intermittent video jitter and audio pops
* Macroblocking reduction on playback of DVR events and in trick mode
* More robust recovery to acquire signal after reboot
* Corrected occurrences of black screens when using PIP and tuning off-air channels
* Corrected reverse at 300X speed function to allow rewind to beginning of the event or capture buffer
* TV2 programming pop-up enhancement for dual user mode and standby state
* Corrected anomaly causing above operating temperature warning pop-up appearance when not valid
* Off-air DTV tuning enhancement to reduce loss of signal occurrences and macroblocking under good signal cases
* Improvements to eliminate intermittent video jitter and audio pops
* Macroblocking reduction on playback of DVR events and in trick mode
* More robust recovery to acquire signal after reboot
* Corrected occurrences of black screens when using PIP and tuning off-air channels
* Corrected reverse at 300X speed function to allow rewind to beginning of the event or capture buffer
* TV2 programming pop-up enhancement for dual user mode and standby state
* Corrected anomaly causing above operating temperature warning pop-up appearance when not valid