Needs new 100 Amp panel

Now we're on a 1995 Carrier package unit, producing a little bit of heat with the heat pump, but the breaker for the heat strips was tripped. I checked the heat strips, they were just pulling 40 amps, but I come around to this, and this is the breaker for my heat strips. I'm not sure if I'm going to be able to reuse that or not. I'm going to pull that piece off and we'll see.