SX-950 Stereo Pioneer Receiver

Question

SX-950 31year old Pioneer Receiver will sometimes click on with the surge protection switch and sometimes not. If the unit does click on it will play fine for a minute or so then click off again. The power relay part no. ASR-019-0 type 4U 24VDC is the problem I think. Of course no one has the part or will help with cross refrence for a replacement. I have thoroughly cleaned the inside and rewired the speakers.Do you have suggestions or even a solution.