MD-82
Maintenance Powerplant; Maintenance Airframe
Confusion; Situational Awareness; Communication Breakdown
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Diverted; General Maintenance Action
Aircraft; Human Factors; Logbook Entry
MD-82 aircraft flying from ZZZ to ZZZ1 diverted into ZZZ2 for maintenance.  The discrepancy was: After takeoff the Battery Charger light came on. Flight Attendant in the back of aircraft reported a large amount of water that came from the overhead area of aircraft. After further investigation found Circuit Breakers (CB) # L5; X25; Z24 and the entire Ground Service Bus inoperative. All other electrical indications were normal.  Sign-off was;  Removed and Replaced (R/R) Battery Charger IAW Aircraft Maintenance Manual (AMM) 24-30-02. Reset circuit breakers. Operational Check (Ops) [was] normal.  Windshield Anti-Ice Ops checks normal IAW AMM 34-41-00. Ok for service.  I omitted stating that we had checked overhead panels; floors and the Electrical Equipment (E/E) compartment and had found no evidence of water.  Also; while talking with the crew; they stated that ZZZ had lots of rain the night before; and lots of condensation that morning in the aircraft. I believe that any water that came from the overhead area of the aircraft was the result of condensation in the aircraft Air Ventilation System.    Due to the discussions we had that day; I believed that the statement about water coming from the overhead areas was more of information into the discrepancy that needed to be investigated and not a discrepancy itself that needed to be addressed; in the action taken block in the Aircraft Maintenance Logbook (AML).  Don't assume any information in the [Logbook] Discrepancy block doesn't need to be addressed in the [Logbook's] Action Taken block.
A Line Aircraft Maintenance Technician (AMT) explains why he did not state in a Logbook sign-off that he had also checked the cabin overhead panels; floors and the E/E compartment for evidence of water intrusion after he had Removed and Replaced (R/R) a Battery Charger. The MD-82 aircraft had diverted due to a Battery Charger light illuminating in flight.