Tradewind range hood- model PSL736: both lights out, fan works

The screws by the lights probably only hold the fixture in place. If you took the screws out you would only get access to the fixture and maybe some wiring. If you have already replaced the lights you can assume its not the fixtures. Not likely both fixtures failed at the same time. The common problems would be the light switch. You would need to gain access to the switch and then check that for power.

You already know house power is good because the fan is working, But since both lights failed and new bulbs don't fix the problem it would most likely be a switch.

According to their website it looks like that whole front panel should come off including the fixtures and the switches.

MAKE SURE THE POWER IS TURNED OFF......REMEMBER THE FAN WON'T WORK IF THE POWER IS OFF.

Once you remove that you can check the wiring harness for the lights. You may also see wire nuts on the harness double check those as well.