Unless you have owner documents, I think it's a Roof-Only job. Somebody correct me, but I don't think taking the bottom/inside portion off will show anything helpful. I have only worked on Coleman. On those, you can see a label on the sheet metal after removing the plastic shroud. Turn POWER OFF before you go up. Again on Coleman, there's a little sheet metal cover over the capacitors. If you can get the Model/Serial information, great. If you can photograph the Label, that's great. If you can photo the Capacitors, good again. If you can, without getting zapped by charged capacitors, write down the nomenclature on the Capacitors. Or you can short across the terminals of each Capacitor with the blade of an insulated tool and approach them safely POWER OFF REMEMBER.
Capacitor nomenclature would be something like:
40 MFD at 440 Volts. There should be a Compressor Run Cap and a Fan Run Cap. These may be combined on one "can." Then more likely than not a Compressor Start Cap. That one's likely to be plastic.
IF you can do it safely, get up there and get the info. While you're there make sure the fan shaft spins freely.
Waiting and ready to help.