Clean that area really well, then watch it. If there is some liquid down in there from whatever, it will bubble (boil?) when hot, because, it's really hot there. IOW, bubbles there do not always indicate pressure leaking out.
I listed the hardline torque value somewhere here in the past, bet you can find it faster than I on my slow connection.
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1985 744 gle d24t
1985 745 gle d24t
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