Out of the thousand of Disk ][ cards I have seen, that bubbling on the second drive connector is always there, even on a brand new card. Perhaps it's a manufacturing issue or something but it is always there.
What worries me is the chips on the card, their date codes are too broad (from '79 to '81, with a majority on '80). This to me says that the card was repaired at least once before. Even the date codes on the PROMs do not match when they usually do, so one of them had to have been replaced before.
What chip was blown on the disk drive board? This usually happens when the disk header is plugged in backwards or off by a pin or two. But it also blows out a couple chips on the board. I need to find my notes I compiled with Dr Levinson about disk drive and card repair. The problem is usually the 74XXX series on the card. But the thing is, do you have a Killer Card?
A killer card is when one of the 74XXX is shorted and plugging a drive to it kills the drive by blowing a chip or two on the board (usually the stepper motor controller chip - I forget its component number).
But if another 74XXX chip blows, you get a Disk (Not Drive) Killer Card. Plugging the drive to the board, it looks like its booting but it never does. The head goes into a Magnetic High - Write Mode (regardless what Write Protect Switch says) and erases first track the disk you put in. If you put in the disk before turning it on, as the head goes bak and forth to seek track 0, it erases those tracks. It is like rubbing a magnet on your disk. After replacing the chips at fault, you also need to use a head demagnetizer to the drive's head as well.
Thing is, I do not remember which 74XXX does what damage when blown. Best to replace them all since there are 4 of them. also replace the 556 Timer chip on the card too.
I have no experience setting up/installing anything on an Apple ][ so this is a new journey for me... 
