In all but a few narrow exceptions, property that was titled in the deceased's name at the time of death must go through probate. Title to most assets, such as real estate and bank investment accounts, cannot be changed without going through probate.
To get a Pennsylvania short certificate, you need the following: "Open" the estate by filing a petition for grant of letters with the Register of Wills of the PA county where the deceased lived at the time of their death. Original death certificate. An identification card. Submit a copy of the will if available.
Note that short certificates are valid for 60 days, but death certificates never expire. These will be required by each bank and stock transfer agent, if there are any, as well as for such items as automobile transfers. Direct deposit items, if any, should be terminated.