Bring back my 2.5 190d

[Snafu]

Hello to forum and thanks in advance for any help.I have owned many mbs over the years although none newer than 94. I have a 87 2.5t that way back in the 90 had a drip from between engine and trans...so I had a mechanic replace the seal...when he gave me the car back it did not move...i dont remember any tranny problems before...he was not a mb specialist...the good part it doesn't leak lol.anyway I put the car in storage in a warehouse for 15 -20yrs...This week I was getting ready to flush the fuel see if it run...it starts right up and runs good after 15yrs sitting.thought I would take a shot on this forum for a list of what to check in the vehicle before going the replace tyranny route...there is no movement in r or any drive position with engine running..my thought 15 yrs ago was he cracked the pump putting back together...not sure if that is easy to do on this model...anyone have a check list of things I can try?..jacking it up tonite to root around underneath.