The neck and back pain lingered at least until his August 2008 deposition, when he said, "I always try to do stretches for my neck. Usually pain killers help a little bit."
The lawsuit was settled in May 2010 after Perdomo's attorney made a $5,000 settlement offer. The actual final settlement amount is not included in court records.
Perdomo had by then also settled, for payment to him of $3,800, a worker's compensation claim stemming from burns he received in October 2007 while employed as a $17-an-hour automotive technician, according to court records. The records do not reveal the exact cause of the second-degree burns to his face, arm and torso.
After his 2005 discharge, he enrolled in Seminole Community College, where he earned degrees in automotive technology and became certified as an Emergency Medical Technician and firefighter, he said in his deposition.
Perdomo was reported missing Sunday after driving from Florida to Maine last week.
His rental car was found abandoned in a Bangor Walmart parking lot. Bangor police said they reviewed surveillance video and it showed someone getting out of the car around 8:15 a.m. Friday and walking away from the store. It's not known, however, who the person is.
Perdomo, a firefighter and emergency medical technician at Seminole County Fire Department Station 41 in Sanford, last had contact with his wife, Tonya, via a text message that he sent her Thursday night.
Several of Perdomo's coworkers headed to Bangor to help search for him on Friday. Dave Williams and Troy Todak said they are going to Maine to pass out information and talk to local media there to raise awareness of the disappearance.
They said they plan to "lay the groundwork" for a future search, in which they will invite more Seminole County firefighters.
PHOTOS: Firefighter vanishes
Their trip is being funded by the firefighters union and private donors. They said they don't know when they'll come back home but if they leave, they'll be replaced by others.
A fund for Perdomo is also being set up at Wells Fargo later Friday.
Watch Local 6 News for more on this story.