1995 Roadmaster Oil Pressure Sending Unit

[thefrankelope]

I am new to the forum so please bear with me. I have the following car -
1995 Buick Roadmaster
Base model
5.7L 350 LT1
Automatic Transmission
Has about 82,000 miles on it

I have an oil leak that I thought would be fixed when I took it into the repair shop. There was a leak at the front and rear intake manifold and new gaskets were put in place. Unfortunately, that didn't stop the leak. Now, I am thinking maybe the OPSU is leaking. My question is - does anyone know if there is a diagram showing how to assemble/disassemble the OPSU from the engine. The leak is coming from up high, leading me to believe it is the OPSU. Does anyone have any suggestions of where to look further for the leak(s)? Is this a common problem with this engine or something? I am a typical "shade tree mechanic" with moderate experience so be gentle.

Thank you in advance for any help you guys might have for my problem.

TheFrankelope