[beenthere]

The electrical storm caused some breakers to trip?

Then you robably got a surge to it.

Electonic boards are NOT built to last forever in HVAC.
Mostly because people wouldn't pay the price for the equipment then.

 

[beenthere]

Probably an open roll out switch.

 

[beenthere]

Component.

Look for small sensors near the burners. See if any of them are tripped.

Might also be one on the blower housing also.

If any are tripped. You got more trouble then what you though.

 

[beenthere]

Some roll outs, open the circuit to both the HSI and gas valve, and some just to the gas valve.

 

[beenthere]

If you mean pressure switch.
Its not the switch that is causing the fuse to blow.

 

[beenthere]

Other then the typical heating and cooling speed tap terminals. It doesn't control the blower speed.

No return problems? No supply problems? Then your air flow must be ok.

With the thermostats fan switch turned to on. Go to one of your problem registers. See how the air feels blowing out. Then remove your air filter, and see if it blows out more. if so. Your return could use some work. And probably your supply also.

 

[beenthere]

Is your A/C coil plugged?