A Line Mechanic reports an engine Reverser on an A320 aircraft failed to deploy upon landing after he had completed a bleed valve installation. Mechanic also noted that a lack of adequate shift turnover information and failure by the previous shift to make a write-up for the Locked-out reverser; contributed to the event.

Narrative

One night; February 2012; I; Mechanic X; and Mechanic Y continued to remove the Bleed Valve off of an A320 aircraft for an engine boroscope from where swing shift had left off. After the Engine Shop had finished with the boroscope; we both proceeded to reinstall the bleed valve per the Maintenance Manual Supplement 72-037. After installation; I ran the engine for a leak check. Then we towed the plane down to the gate. Apparently when the plane was approaching the runway in ZZZ1; the reverser would not deploy upon landing. The mechanics in ZZZ1 had found that the reverser was still locked-out. That's when I got a call from Supervisor X on my Days-off and he had told me what they had found in ZZZ1. I told Supervisor X that there was no write-up that the reverser had been locked-out per the General Maintenance Manual (GMM). So then I called up my partner; Mechanic Y; and he told me that Swing Shift [Maintenance] had left a note up in the cockpit taped to FADEC; saying the reverser had been locked-out; but [he] did not bring it to my attention at the time. He had told me this three days later; also on his Days-off.