Help with transistors

[Den.]

Hi... I'm looking at a Bose L1 model II PA amplifier and I'm looking for help in interpreting a series of voltage measurements. There's a pair of what I think are transistors that look suspicious. On the diode mode these are the readings I got. Can someone help me? Thanks.You cannot view this attachment.You cannot view this attachment.

[galaxiex]

Those look like voltage regulators.

Clean the schmoo off the top where the "L78" number is so we can read it.
That is likely the part number.