repairing a bad repair

[nonone]

New to group and need some help. I have 1n 1987 F20 that was new to me last
year. While inspecting the transom mounted transducer, I noticed water dripping from a small crack in the bottom. After scraping away paint there appears to bad repair on the starboard inboard lifting strake. My guess is its a
Marine Tex or Bondo like repair. After scraping further, the the glass beneath
the gelcoat is exposed for about eight inches. The flaw is about a half inch wide
and runs from about three inches from transom about 8 inches forward. I guess the sub zero winter wasn't kind to the fix. Unfortunately, the
glass is is quite wet and still dripping after two weeks. Spoke to a few local fiberglass repair people who advised to grind it and let it dry and then reglass "Easy Repair"
My fear is that this strake may be located near or under stringer. Sounds like t wood may beneath the glass. If I grind it I may open a large can of worms and be into a major repair which i don't really don't want to do. Any and all advise greatly appreciated.