Monarch actually did sue the airport over the 737 bricks incident but lost the case as the judge determined that the level of negligence was not sufficient to override the "use is at your own risk" clause in the airport's contract. This despite the fact that the airport had previously been warned by an expert in writing that this situation could occur. Funny thing at times, the law.
The 757 that had engine failures when it ran over the chamfered edge of the runway resurfacing was indeed hangared for investigation when it was found that a broken spring (inside IIRC the engine start switch) was being thrown about by the shock of the impact with the tarmac edge and was short circuiting electrical terminals which caused the engine to shut down. A huge amount of head scratching took place before this was found though!