For those of you who have been following this thread, it appears that Leutnant Straßner is likely the pilot of the JU 88 that took down my Dad's Lancaster on the night of July 28, 1944. Dad has composed a letter to Leutnant Straßner with some details of the attack that may confirm wether or not this is the case. We are in the process of having a neighbur translate the letter into German. Erich has offered to use his resources and attempt to deliver this letter to Straßner or someone who knew him. Letter below:

Letter to Leutnant Straßner from F/L E.A. Campbell

Herr Straßner:
Could it be that you and I have met before? It is possible. The following will briefly outline the events leading up to the hour of midnight on July 28th 1944.
Lancaster A2 C from RAF Sqdn 514 was on a southeasterly course south of Chateaudun approaching Orleans. We were in a cloud layer which was only some 500 feet thick and was diminishing. The wireless operator reported an aircraft approaching from the rear and slightly below our altitude. It slowed down to our speed and then remained in that position. One or two more aircraft soon appeared and took up similar positions only further out to the sides. The gunners were unable as yet to obtain any visual contact. Just before midnight the wireless operator informed me that he was leaving the "visual monica set" in order to tune into base for any possible changes or instructions.
Suddenly we came to the end of the cloud and out into clear bright moonlight. The rear gunner shouted "Fighter-Port-Go" while at the same time shells came thumping into our aircraft. The two port engines caught fire as the fuel tanks were ripped open and set ablaze. The windscreen was taken out along with my DR compass. I caught just a fleeting glimpse of what appeared to be a JU88 banking away. A second attack put out the starboard inner engine.
I had alerted the crew to "Put on parachutes" then shortly after that to "Abandon Aircraft,Jump Jump Jump". We carried a second pilot that night who was severely injured in the attack and died the next day. The navigator who suffered leg injuries was unable to run and was taken prisoner. The rest of us evaded capture and with much help from the resistance workers were able to make our way back to England.
We flew a Mark2 Lancaster which is equipped with Bristol Hercules Radial engines. This, I am sure, accounted for us being sometimes identified as a Halifax bomber. The two aircraft would present a very similar silhouette especially from behind.
Some of us were sheltered in a "safe house" which was close to an airfield. JU88's would take off and climb just over our heads. The wheels would still be rotating as the undercarriage was retracting. On the nose of each aircraft was mounted a large array of forward facing antennae. I believe the runway was just to the east of us.
We were an experienced crew on our 25th operation. So far we had survived quite a number of fighter attacks by several different types of planes. I would like to say that the aircraft that brought us down was in the hands of a well trained crew that coordinated and carried out a brilliant attack.You are to be commended.
I hope this will be of interest to you.
Flight Lieutenant E.A. Campbell RCAF (Ret)