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Diodes and transistors sometimes short when they are feeding excessive current into a shorted capacitor.
I'm not one to advise on troubleshooting that kind of issue as once something that new fails that bad I usually throw it out.
If all you care about is the tape there are ways of recovering tapes from dead mechs.
If the tape isn't threaded onto head drum simply locate the motor that actuates the eject mechanism and hook a 9V battery up to get it to spit the tape out (reverse polarity if it don't move the right direction), or if the eject mech is jammed unscrew stuff above the tape till you can lift the tape out by hand.
If the tape is threaded before you can work the eject mech you need to find the threading motor and get it to spin to the unthread position (9V battery again is good for that) then find a way to spin the supply or take up reel on the tape to suck all the tape back into the cassette. Once all the tape is back into the cassette shell you can safely skip to the above paragraph on the eject mech.
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