I just got a hit on 154.905 MHz (Ch 1 PL 173.8) last weekend on an accident on Hwy 138 in San Bernardino County. The responding unit was a crown vic, hence the old extender. Don't delete it from your scanners just yet...
154.905 is still active IF there is a Vic in the office. K9's are still mixed between Explorers and Vic's so you're more than likely to hear it IF there is a K9 unit out and about.