Soundstream TA1.3000D

U2,U3 in this amp I believe are the 5 volt regulators .

I don’t know if the originals were The KIA78L,79L or the KIA7905,7805

I believe U3 is the 7905 but when measuring the voltage on the pads I get -14.58 volts on 1 of the pads . Does this mean it’s the ground pin or how Do I figure out what direction these go in the amp
 

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Here’s some pics of the amp
 

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