Your dish appears to be in really good shape. I say get a pole in the ground and get it back in service.
Not Unimesh or Winegard, but FWIW: I rescued a 7.5' Echostar/KTI that needed a lot of TLC. After straightening panels and replacing a piece of missing mesh, I put a Titanium C-band PLL LNBF on it.
Several hours of fine tuning and it's tracking the arc pretty well from 78W to 139W (trees block beyond 78W). I have not had trouble with locking and scanning most transponders. However, there are a handful of transponders that I've found that are just below locking threshold (at least with my equipment). I'm located about in the center of the U.S., your location might vary your results.
Overall, I've been very happy with the performance of this dish and LNBF combo. I get a good stable lock on everything I'm wanting to watch. My biggest issue with the 7.5' dish is my worn out actuator... I also have a 10' dish that I could swap in for the 7.5', but the smaller dish has worked well enough to put that project on hold.
Good luck with your project and keep us posted!