OK, here's what I understand so far:

1) I need to remove the convertible top hydraulic pump assembly and send it to Top Hydraulics for testing
2) If testing indicates, authorize Top Hydraulics to rebuild the pump as required
3) If the testing shows the pump to be operating normally, look for another cause for the top's operational problem
4) If step "3" is indicated, determine the remedy and perform it
5) Remove all seven top-related hydraulic cylinders and send to Top Hydraulics for rebuild
6) Put it all back together, add fluid and hope it works

This sound correct? I am a bit apprehensive about removing the pump assembly, but willing to have a go (any additional guidance or tips re that task are welcome)

Thanks for all the continuing help!