Per Total Warfare page 195, an engine critical hit on a vehicle disables all direct-fire energy and pulse weapons (among its other effects). Strictly by-the-book, this would also apply to chemical lasers (Tactical Operations pages 319/20, stats on pages 406/7), since they do have the "DE" code for direct-fire energy. Yet at the same time, they're at least partially also considered ballistic weapons for construction purposes, are ammo-dependent, and their entire concept basically seems to revolve around the notion that they're not actually powered by the engine.
So, should a vehicle with a chemical laser and a critically hit engine still be able to fire that laser (assuming a target happens to wander into the appropriate firing arc) or not?