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so there may well be another fault....!
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An OP sparking and smoking indicates more than a duff 7915. As advised see if you can find what the 7915 was attached to.
Also as you say the +15/-15v rails are for the preamp, the main PSU might be ok, but worth checking. With the 7915 removed do a resistance test from it's OP pin pad to gnd.
Andy.